Knowledge (XXG)

Control character

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1470:, which can only be switched one way, usually from one to zero. In such PROMs, the DEL and NUL characters can be used in the same way that they were used on punched tape: one to reserve meaningless fill bytes that can be written later, and the other to convert written bytes to meaningless fill bytes. For PROMs that switch one to zero, the roles of NUL and DEL are reversed; also, DEL will only work with 7-bit characters, which are rarely used today; for 8-bit content, the character code 255, commonly defined as a nonbreaking space character, can be used instead of DEL. 1224:. Later, control characters were integrated into the stream of data to be printed. The carriage return character (CR), when sent to such a device, causes it to put the character at the edge of the paper at which writing begins (it may, or may not, also move the printing position to the next line). The line feed character (LF/NL) causes the device to put the printing position on the next line. It may (or may not), depending on the device and its configuration, also move the printing position to the start of the next line (which would be the leftmost position for 1262:. End of medium (EM) warns that the tape (or other recording medium) is ending. While many systems use CR/LF and TAB for structuring data, it is possible to encounter the separator control characters in data that needs to be structured. The separator control characters are not overloaded; there is no general use of them except to separate data into structured groupings. Their numeric values are contiguous with the space character, which can be considered a member of the group, as a word separator. 300: 1075:), produces the code 7 (BELL, 7 in base ten, or 0000 0111 in binary). The NULL character (code 0) is represented by Ctrl-@, "@" being the code immediately before "A" in the ASCII character set. For convenience, some terminals accept Ctrl-Space as an alias for Ctrl-@. In either case, this produces one of the 32 ASCII control codes between 0 and 31. Neither approach works to produce the DEL character because of its special location in the table and its value (code 127 1459:. Paper tape became obsolete in the 1970s, so this clever aspect of ASCII rarely saw any use after that. Some systems (such as the original Apples) converted it to a backspace. But because its code is in the range occupied by other printable characters, and because it had no official assigned glyph, many computer equipment vendors used it as an additional printable character (often an all-black "box" character useful for erasing text by overprinting with ink). 1250:
take advantage of the flexibility of the new terminals, and indeed of newer printers. The concept of a control character had always been somewhat limiting, and was extremely so when used with new, much more flexible, hardware. Control sequences (sometimes implemented as escape sequences) could match the new flexibility and power and became the standard method. However, there were, and remain, a large variety of standard sequences to choose from.
1067:", "Ctrl", or (rarely) "Cntl" which is used much like a shift key, being pressed in combination with another letter or symbol key. In one implementation, the control key generates the code 64 places below the code for the (generally) uppercase letter it is pressed in combination with (i.e., subtract 0x40 from ASCII code value of the (generally) uppercase letter). The other implementation is to take the ASCII code produced by the key and 221: 3732: 1137: 50: 1374:) to start transmission. It has become so widely used that most don't realize it is not part of official ASCII. This technique, however implemented, avoids additional wires in the data cable devoted only to transmission management, which saves money. A sensible protocol for the use of such transmission flow control signals must be used, to avoid potential deadlock conditions, however. 1311:) was intended to request a translation of the next character from a printable character to another value, usually by setting bit 5 to zero. This is handy because some media (such as sheets of paper produced by typewriters) can transmit only printable characters. However, on MS-DOS systems with files opened in text mode, "end of text" or "end of file" is marked by this 1249:
that did not physically print on paper and so offered more flexibility regarding screen placement, erasure, and so forth, printing control codes were adapted. Form feeds, for example, usually cleared the screen, there being no new paper page to move to. More complex escape sequences were developed to
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scripts such as the Hebrew and Arabic alphabets). The vertical and horizontal tab characters (VT and HT/TAB) cause the output device to move the printing position to the next tab stop in the direction of reading. The form feed character (FF/NP) starts a new sheet of paper, and may or may not move to
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character with no meaning otherwise. Since the position of a NUL character has no holes punched, it can be replaced with any other character at a later time, so it was typically used to reserve space, either for correcting errors or for inserting information that would be available at a later time
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keys. In other words, it does not matter whether the key would have produced an upper-case or a lower-case letter. The interpretation of the control key with the space, graphics character, and digit keys (ASCII codes 32 to 63) vary between systems. Some will produce the same character code as if
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quite expensive to implement, thus a different code for each and every function looked like a requirement. It quickly became possible and inexpensive to interpret sequences of codes to perform a function, and device makers found a way to send hundreds of device instructions. Specifically, they used
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The start of heading (SOH) character was to mark a non-data section of a data stream—the part of a stream containing addresses and other housekeeping data. The start of text character (STX) marked the end of the header, and the start of the textual part of a stream. The end of text character (ETX)
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and other electronic output devices, there are often software (or hardware) configuration choices that allow a destructive backspace (e.g., a BS, SP, BS sequence), which erases, or a non-destructive one, which does not. The shift in and shift out characters (SI and SO) selected alternate character
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functions. The associated keypresses are communicated to computer programs by one of four methods: appropriating otherwise unused control characters; using some encoding other than ASCII; using multi-character control sequences; or using an additional mechanism outside of generating characters.
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by printing a caret (^) and then the ASCII character that has a value of the control character plus 64. Control characters generated using letter keys are thus displayed with the upper-case form of the letter. For example, ^G represents code 7, which is generated by pressing the G key when the
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The device control codes (DC1 to DC4) were originally generic, to be implemented as necessary by each device. However, a universal need in data transmission is to request the sender to stop transmitting when a receiver is temporarily unable to accept any more data.
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When a transmission medium is half duplex (that is, it can transmit in only one direction at a time), there is usually a master station that can transmit at any time, and one or more slave stations that transmit when they have permission. The enquire character
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Keyboards also typically have a few single keys which produce control character codes. For example, the key labelled "Backspace" typically produces code 8, "Tab" code 9, "Enter" or "Return" code 13 (though some keyboards might produce code 10 for "Enter").
1300:) was intended to "quote" the next character, if it was another control character it would print it instead of performing the control function. It is almost never used for this purpose today. Various printable characters are used as visible " 1408:), was originally sent by synchronous modems (which have to send data constantly) when there was no actual data to send. (Modern systems typically use a start bit to announce the beginning of a transmitted word— this is a feature of 1091:
the control key were not held down. Other systems translate these keys into control characters when the control key is held down. The interpretation of the control key with non-ASCII ("foreign") keys also varies between systems.
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There were quite a few control characters defined (33 in ASCII, and the ECMA-48 standard adds 32 more). This was because early terminals had very primitive mechanical or electrical controls that made any kind of state-remembering
1273:(JSON Text Sequences) to encode a sequence of JSON elements. Each sequence item starts with a RS character and ends with a line feed. This allows to serialize open-ended JSON sequences. It is one of the 1346:) is generally used by a master station to ask a slave station to send its next message. A slave station indicates that it has completed its transmission by sending the end of transmission character ( 1381:) was intended to be a signal to the other end of a data link that the following character is a control character such as STX or ETX. For example a packet may be structured in the following way ( 3350: 1293:
for error-detection purposes. The end of transmission block character (ETB) was used to indicate the end of a block of data, where data was divided into such blocks for transmission purposes.
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communication links were more often seen with mainframes, where they were typically run over corporate leased lines to connect a mainframe to another mainframe or perhaps a minicomputer.)
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that identify the specific physical keys that are pressed; computer software then determines how to handle the keys that are pressed, including any of the four methods described above.
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is "Cc". Formatting codes are distinct, in General Category "Cf". The Cc control characters have no Name in Unicode, but are given labels such as "<control-001A>" instead.
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as control characters. This was primarily done so that if the high bit was stripped, it would not change a printing character to a C0 control code. This second set is called the
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The transmission control characters were intended to structure a data stream, and to manage re-transmission or graceful failure, as needed, in the face of transmission errors.
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Printing control characters were first used to control the physical mechanism of printers, the earliest output device. An early example of this idea was the use of
411:(EBCDIC) character set contains 65 control codes, including all of the ASCII control codes plus additional codes which are mostly used to control IBM peripherals. 2140: 408: 2215: 1729: 1334:) is a definite flag for, usually, noting that reception was a problem, and, often, that the current element should be sent again. The acknowledge character ( 1455:
when overpunched. Paper tape was a common storage medium when ASCII was developed, with a computing history dating back to WWII code breaking equipment at
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The control characters were designed to fall into a few groups: printing and display control, data structuring, transmission control, and miscellaneous.
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Many of the ASCII control characters were designed for devices of the time that are not often seen today. For example, code 22, "synchronous idle" (
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the start of the first line. The backspace character (BS) moves the printing position one character space backwards. On printers, including
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The separators (File, Group, Record, and Unit: FS, GS, RS and US) were made to structure data, usually on a tape, in order to simulate
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Many keyboards include keys that do not correspond to any ASCII printable or control character, for example cursor control arrows and
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In Unicode, "Control-characters" are U+0000—U+001F (C0 controls), U+007F (delete), and U+0080—U+009F (C1 controls). Their
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marked the end of the data of a message. A widely used convention is to make the two characters preceding ETX a checksum or
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it with 0x1F, forcing bits 5 to 7 to zero. For example, pressing "control" and the letter "g" (which is 0110 0111 in
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in ASCII, where code point 00xxxxx is represented as a caret followed by the capital letter at code point 10xxxxx: ^G
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Early symbols assigned to the 32 control characters, space and delete characters. (ISO 2047, MIL-STD-188-100, 1972)
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When the control key is held down, letter keys produce the same control characters regardless of the state of the
850:), moves the printing position to the start of the line, allowing overprinting. Used as the end of line marker in 60: 3370: 3325: 3161: 2710: 2414: 2359: 2324: 1423:) is a special case. In paper tape, it is the case when there are no holes. It is convenient to treat this as a 2885: 2394: 2374: 2369: 2309: 2304: 1813: 1031: 82: 3735: 3719: 3646: 3641: 3603: 3574: 3539: 2971: 2705: 2404: 2289: 1496: 1405: 1386: 1382: 1378: 1290: 1119:
made in the 1980s typically use one (or both) of the first two methods. Modern computer keyboards generate
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sets, fonts, underlining, or other printing modes. Escape sequences were often used to do the same thing.
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There are a number of techniques to display non-printing characters, which may be illustrated with the
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An old RFC, which explains the structure and meaning of the control characters in chapters 4.1 and 5.2
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to the 10th cell of the 2nd line of the screen. Several standards exist for these sequences, notably
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Control characters may be described as doing something when the user inputs them, such as code 3 (
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to cause effects other than the addition of a symbol to the text. All other characters are mainly
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scripts, such as the alphabets used for Western languages, and the rightmost position for
1107: 1027: 963:. These uses usually have little to do with their use when they are in text being output. 936: 835: 633: 628: 448: 270: 3151: 3146: 3136: 3131: 3126: 3121: 3085: 3080: 3073: 3068: 3063: 3058: 3053: 3048: 3043: 3038: 3033: 3028: 2896: 2853: 2848: 2843: 2838: 2833: 2828: 2823: 2818: 2813: 2808: 2803: 2798: 2793: 2788: 2783: 2690: 2685: 2680: 2675: 2670: 2665: 2660: 2655: 2650: 2645: 2640: 2635: 2419: 2399: 2004: 1924: 1919: 1914: 1909: 1904: 1899: 1894: 1889: 1884: 1752: 1437: 1420: 1398: 1274: 1095: 1020: 990: 928: 851: 717: 686: 663: 618: 538: 433: 374: 281: 1010:
A special character condensing the abbreviation: Unicode U+2407 (␇), "symbol for bell"
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are typically implemented as arrays of fusible elements, each representing a
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American National Standard Code for Information Interchange | ANSI X3.4-1977
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to shift between two code pages. A later, but still early, example was the
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Code point in a character set, that does not represent a written symbol
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invented a convention which used 19 (the device control 3 character (
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Control characters are often rendered into a printable form known as
1401:) is intended to cause an audible signal in the receiving terminal. 1115:
typically use control sequences. Keyboards attached to stand-alone
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or in another place. In computing, it is often used for padding in
1035: 3684: 3402: 3397: 3392: 3009: 2715: 2225: 2165: 2027: 1801: 1366:) to "S"top transmission, and 17 (the device control 1 character ( 994: 350: 335: 298: 291:
Some control characters have also been called "format effectors".
201: 1447:, a.k.a. "rubout") is likewise a special case. Its 7-bit code is 2995: 2085: 1017:
graphical representation: Unicode U+237E (⍾), "graphic for bell"
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give printing devices enough time to execute a control function
331:, followed by the printable characters "[2;10H", would cause a 284:(BEL), which rang a bell to alert operators, was also an early 3462: 1467: 1130: 871: 315: 215: 43: 912:). Acts as an end-of-file for the Windows text-mode file i/o. 681:
The control characters in ASCII still in common use include:
327:, the father of ASCII. For example, the sequence of code 27 1451:
in binary, which essentially erased a character cell on a
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standard there are 33 control characters, such as code 7,
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A form of control characters were introduced in the 1870
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The Unicode Standard Version 13.0 – Core Specification
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MS-DOS QBasic v1.1 Documentation. Microsoft 1987-1991.
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National Institute for Standards. 1977. 413: 309:C0 and C1 control codes § C0 controls 1668: 1541: 1265:For example, the RS separator is used by 1185:Learn how and when to remove this message 134:Learn how and when to remove this message 32:Non-printing character in word processors 751:), may overprint the previous character. 1523: 1481:, as they may have reserved functions. 1055:How control characters map to keyboards 7: 1660:ASCII format for Network Interchange 1533:ASCII format for network interchange 1163:adding citations to reliable sources 72:adding citations to reliable sources 1477:do not allow control characters in 3074:Norwegian and Danish (alternative) 870:-80 and its derivatives including 174:that does not represent a written 25: 404:) and the 65 control characters. 258:are a form of control character. 3731: 3730: 1622:from the original on 2022-10-09. 1586:from the original on 2022-10-09. 1377:The data link escape character ( 1135: 219: 48: 3518:Digital encoding of APL symbols 3453:Comparison of Unicode encodings 1971:Proposed but not approved 1385:) <STX> <PAYLOAD> ( 1362:), also known as control-S, or 1222:ASA carriage control characters 373:) is also a control character. 208:, which rings a terminal bell. 59:needs additional citations for 1: 1356:Digital Equipment Corporation 1004:: decimal 7, hexadecimal 0x07 953:End-of-Transmission character 333:Digital Equipment Corporation 1201:Printing and display control 178:or symbol. They are used as 3690:Character encodings in HTML 3024:National Replacement (NRCS) 2991:Japanese language in EBCDIC 1491:Arrow keys § HJKL keys 3771: 1570:"5.2 Control Characters". 1315:character, instead of the 1307:The substitute character ( 1099:control key is held down. 973:Unicode control characters 970: 306: 36: 29: 3728: 1304:", depending on context. 669: 654: 639: 624: 609: 594: 579: 564: 549: 534: 519: 504: 489: 474: 459: 444: 429: 424: 421: 3720:Variable-length encoding 3501:Miscellaneous code pages 2259:Extended Unix Code / EUC 1950:-15 (New Western Europe) 1746:Early telecommunications 1434:mark the end of a string 1419:Code 0 (ASCII code name 1370:), a.k.a. control-Q, or 1038:character string codes: 711:mark the end of a string 265:: NUL and DEL. The 1901 37:Not to be confused with 3647:C0 and C1 control codes 1704:C0 Set of ISO 646 (PDF) 1497:C0 and C1 control codes 812:), vertical tabulation. 196:), except perhaps for " 1895:-3 (Maltese/Esperanto) 1846:World System Teletext 1326:The cancel character ( 1296:The escape character ( 304: 160:non-printing character 3669:Whitespace characters 3346:Ventura International 1063:have a key labelled " 945:End-of-Text character 703:programming languages 415:ASCII control codes. 402:zero-width non-joiner 338:terminal to move its 302: 200:" characters. In the 3064:Norwegian and Danish 1518:Notes and references 1512:Whitespace character 1430:fixed length records 1281:Transmission control 1159:improve this section 194:printable characters 68:improve this article 3624:Unified Hangul Code 3296:PostScript Standard 3019:Multinational (MCS) 1890:-2 (Central Europe) 1885:-1 (Western Europe) 1739:Character encodings 1640:on October 28, 2009 1393:Miscellaneous codes 1245:With the advent of 1235:hard-copy terminals 416: 381:added the codes 128 353:table below code 32 349:All entries in the 288:control character. 190:printing characters 83:"Control character" 3755:Control characters 3705:Hardware code page 3465:typesetting system 3301:PostScript Latin 1 2957:Cyrillic + Finnish 2864:Windows code pages 2746:IBM AIX code pages 2074:National standards 2005:Ukrainian Cyrillic 1634:"ASCII Characters" 1436:; and formerly to 1247:computer terminals 1127:The design purpose 1117:personal computers 1113:computer terminals 862:(and variants). A 414: 305: 231:. You can help by 185:graphic characters 152:telecommunications 3742: 3741: 3695:Charset detection 3634:Control character 3316:Sharp calculators 3187:Casio calculators 3115:Platform specific 2967:Cyrillic + German 2962:Cyrillic + French 2380:Maltese/Esperanto 2016:Bibliographic use 1900:-4 (North Europe) 1832:T.51/ISO/IEC 6937 1790:Baudot and Murray 1507:In-band signaling 1464:programmable ROMs 1302:escape characters 1195: 1194: 1187: 935:). Introduces an 880:Application Layer 679: 678: 357:(technically the 249: 248: 180:in-band signaling 156:control character 144: 143: 136: 118: 16:(Redirected from 3762: 3734: 3733: 3226:DG International 3101:Special Graphics 2902:Extended Latin-8 2300:Central European 2290:Barents Cyrillic 1995:Barents Cyrillic 1965:-12 (Devanagari) 1961:Abandoned parts 1732: 1725: 1718: 1709: 1689: 1687: 1685: 1684: 1672: 1670:10.17487/RFC0020 1663:. October 1969. 1655: 1649: 1648: 1646: 1645: 1636:. Archived from 1630: 1624: 1623: 1621: 1615:. Unicode, Inc. 1614: 1603: 1597: 1594: 1588: 1587: 1585: 1578: 1567: 1561: 1560: 1558: 1557: 1545: 1543:10.17487/RFC0020 1528: 1412:communication. 1254:Data structuring 1190: 1183: 1179: 1176: 1170: 1139: 1131: 1049: 1045: 1041: 979:General Category 958: 950: 934: 926: 922: 911: 907: 866:pair is used by 865: 849: 845: 841: 830: 826: 822: 811: 807: 803: 788: 784: 780: 769: 765: 761: 750: 746: 742: 731: 727: 723: 700: 696: 692: 417: 377:sets defined by 252:Procedural signs 244: 241: 223: 216: 207: 188:, also known as 139: 132: 128: 125: 119: 117: 76: 52: 44: 39:Escape character 21: 3770: 3769: 3765: 3764: 3763: 3761: 3760: 3759: 3745: 3744: 3743: 3738: 3724: 3700:Han unification 3673: 3628: 3496: 3457: 3375: 3197:Compucolor 8001 3110: 3106:Technical (TCS) 3029:French Canadian 3000: 2976: 2972:Polytonic Greek 2858: 2740: 2424: 2410:Turkic Cyrillic 2325:Font X (Kermit) 2320:Farsi (Persian) 2272: 2263: 2235: 2069: 2011: 1881:Approved parts 1868: 1741: 1736: 1698: 1693: 1692: 1682: 1680: 1657: 1656: 1652: 1643: 1641: 1632: 1631: 1627: 1619: 1612: 1605: 1604: 1600: 1595: 1591: 1583: 1576: 1569: 1568: 1564: 1555: 1553: 1530: 1529: 1525: 1520: 1502:Escape sequence 1487: 1395: 1389:) <ETX>. 1283: 1256: 1239:video terminals 1203: 1191: 1180: 1174: 1171: 1156: 1140: 1129: 1108:word processing 1078: 1057: 1047: 1043: 1039: 1028:escape sequence 987: 975: 969: 956: 948: 937:escape sequence 932: 924: 920: 909: 905: 863: 847: 843: 839: 836:carriage return 828: 824: 820: 809: 805: 801: 786: 782: 778: 767: 763: 759: 748: 744: 740: 729: 725: 721: 698: 694: 690: 388: 384: 368: 356: 330: 322: 311: 297: 271:carriage return 245: 239: 236: 229:needs expansion 214: 205: 140: 129: 123: 120: 77: 75: 65: 53: 42: 35: 28: 23: 22: 15: 12: 11: 5: 3768: 3766: 3758: 3757: 3747: 3746: 3740: 3739: 3736:Character sets 3729: 3726: 3725: 3723: 3722: 3717: 3712: 3707: 3702: 3697: 3692: 3687: 3681: 3679: 3678:Related topics 3675: 3674: 3672: 3671: 3666: 3661: 3660: 3659: 3654: 3644: 3642:Morse prosigns 3638: 3636: 3630: 3629: 3627: 3626: 3621: 3616: 3611: 3606: 3601: 3594: 3593: 3592: 3587: 3582: 3572: 3567: 3562: 3561: 3560: 3555: 3547: 3542: 3537: 3532: 3527: 3526: 3525: 3515: 3510: 3504: 3502: 3498: 3497: 3495: 3494: 3489: 3484: 3479: 3474: 3468: 3466: 3459: 3458: 3456: 3455: 3450: 3445: 3440: 3435: 3430: 3425: 3420: 3415: 3410: 3405: 3400: 3395: 3389: 3387: 3377: 3376: 3374: 3373: 3368: 3363: 3358: 3353: 3348: 3343: 3338: 3336:TI calculators 3333: 3328: 3323: 3318: 3313: 3308: 3303: 3298: 3293: 3288: 3283: 3278: 3273: 3268: 3263: 3258: 3253: 3248: 3243: 3238: 3233: 3228: 3223: 3214: 3209: 3204: 3199: 3194: 3189: 3184: 3179: 3174: 3169: 3164: 3159: 3154: 3149: 3144: 3139: 3134: 3129: 3124: 3118: 3116: 3112: 3111: 3109: 3108: 3103: 3098: 3093: 3088: 3083: 3078: 3077: 3076: 3071: 3066: 3061: 3056: 3051: 3046: 3044:United Kingdom 3041: 3036: 3031: 3021: 3015: 3013: 3002: 3001: 2999: 2998: 2993: 2987: 2985: 2978: 2977: 2975: 2974: 2969: 2964: 2959: 2954: 2949: 2944: 2939: 2934: 2929: 2924: 2919: 2914: 2909: 2904: 2899: 2894: 2889: 2879: 2874: 2868: 2866: 2860: 2859: 2857: 2856: 2851: 2846: 2841: 2836: 2831: 2826: 2821: 2816: 2811: 2806: 2801: 2796: 2791: 2786: 2781: 2776: 2771: 2766: 2761: 2756: 2750: 2748: 2742: 2741: 2739: 2738: 2733: 2728: 2723: 2718: 2713: 2708: 2703: 2698: 2693: 2688: 2683: 2678: 2673: 2668: 2663: 2658: 2653: 2648: 2643: 2638: 2633: 2628: 2623: 2618: 2613: 2608: 2603: 2598: 2593: 2588: 2583: 2578: 2573: 2568: 2563: 2558: 2553: 2548: 2543: 2538: 2533: 2528: 2523: 2518: 2513: 2508: 2503: 2498: 2493: 2488: 2483: 2478: 2473: 2468: 2463: 2458: 2453: 2448: 2443: 2438: 2432: 2430: 2429:DOS code pages 2426: 2425: 2423: 2422: 2417: 2412: 2407: 2402: 2397: 2392: 2387: 2382: 2377: 2375:Latin (Kermit) 2372: 2367: 2362: 2357: 2352: 2347: 2342: 2337: 2332: 2327: 2322: 2317: 2312: 2307: 2302: 2297: 2292: 2287: 2282: 2276: 2274: 2265: 2264: 2262: 2261: 2256: 2251: 2245: 2243: 2237: 2236: 2234: 2233: 2228: 2223: 2218: 2213: 2208: 2203: 2198: 2193: 2188: 2183: 2178: 2173: 2168: 2163: 2158: 2153: 2148: 2143: 2138: 2133: 2128: 2123: 2118: 2113: 2108: 2103: 2098: 2093: 2088: 2083: 2077: 2075: 2071: 2070: 2068: 2067: 2062: 2057: 2052: 2047: 2042: 2037: 2036: 2035: 2030: 2019: 2017: 2013: 2012: 2010: 2009: 2008: 2007: 2002: 1997: 1992: 1984: 1983: 1982: 1977: 1975:KOI-8 Cyrillic 1969: 1968: 1967: 1959: 1958: 1957: 1955:-16 (Romanian) 1952: 1947: 1942: 1937: 1932: 1927: 1922: 1917: 1912: 1907: 1902: 1897: 1892: 1887: 1878: 1876: 1870: 1869: 1867: 1866: 1861: 1860: 1859: 1858: 1857: 1852: 1844: 1839: 1834: 1816: 1811: 1810: 1809: 1799: 1794: 1793: 1792: 1787: 1786: 1785: 1780: 1775: 1770: 1760: 1753:Telegraph code 1749: 1747: 1743: 1742: 1737: 1735: 1734: 1727: 1720: 1712: 1706: 1705: 1697: 1696:External links 1694: 1691: 1690: 1650: 1625: 1598: 1589: 1562: 1536:. 1969-10-01. 1522: 1521: 1519: 1516: 1515: 1514: 1509: 1504: 1499: 1494: 1486: 1483: 1394: 1391: 1282: 1279: 1275:JSON streaming 1255: 1252: 1211:Letters (LTRS) 1207:Figures (FIGS) 1202: 1199: 1193: 1192: 1143: 1141: 1134: 1128: 1125: 1096:caret notation 1076: 1056: 1053: 1052: 1051: 1024: 1021:Caret notation 1018: 1011: 1008: 1005: 991:bell character 986: 983: 971:Main article: 968: 965: 941: 940: 913: 898: 852:Classic Mac OS 832: 813: 794: 771: 756:horizontal tab 752: 733: 714: 677: 676: 671: 667: 666: 661: 656: 652: 651: 646: 641: 637: 636: 631: 626: 622: 621: 616: 611: 607: 606: 601: 596: 592: 591: 586: 581: 577: 576: 571: 566: 562: 561: 556: 551: 547: 546: 541: 536: 532: 531: 526: 521: 517: 516: 511: 506: 502: 501: 496: 491: 487: 486: 481: 476: 472: 471: 466: 461: 457: 456: 451: 446: 442: 441: 436: 431: 427: 426: 423: 420: 386: 382: 375:Extended ASCII 366: 354: 328: 320: 307:Main article: 296: 293: 282:bell character 247: 246: 226: 224: 213: 210: 142: 141: 124:September 2007 56: 54: 47: 26: 24: 14: 13: 10: 9: 6: 4: 3: 2: 3767: 3756: 3753: 3752: 3750: 3737: 3727: 3721: 3718: 3716: 3713: 3711: 3708: 3706: 3703: 3701: 3698: 3696: 3693: 3691: 3688: 3686: 3683: 3682: 3680: 3676: 3670: 3667: 3665: 3662: 3658: 3655: 3653: 3650: 3649: 3648: 3645: 3643: 3640: 3639: 3637: 3635: 3631: 3625: 3622: 3620: 3617: 3615: 3612: 3610: 3607: 3605: 3602: 3600: 3599: 3595: 3591: 3588: 3586: 3583: 3581: 3578: 3577: 3576: 3573: 3571: 3568: 3566: 3563: 3559: 3556: 3554: 3551: 3550: 3548: 3546: 3543: 3541: 3538: 3536: 3533: 3531: 3528: 3524: 3521: 3520: 3519: 3516: 3514: 3511: 3509: 3506: 3505: 3503: 3499: 3493: 3490: 3488: 3485: 3483: 3480: 3478: 3475: 3473: 3470: 3469: 3467: 3464: 3460: 3454: 3451: 3449: 3446: 3444: 3441: 3439: 3436: 3434: 3431: 3429: 3426: 3424: 3421: 3419: 3416: 3414: 3411: 3409: 3406: 3404: 3401: 3399: 3396: 3394: 3391: 3390: 3388: 3386: 3385:ISO/IEC 10646 3382: 3378: 3372: 3369: 3367: 3364: 3362: 3359: 3357: 3354: 3352: 3349: 3347: 3344: 3342: 3339: 3337: 3334: 3332: 3329: 3327: 3324: 3322: 3319: 3317: 3314: 3312: 3309: 3307: 3304: 3302: 3299: 3297: 3294: 3292: 3289: 3287: 3284: 3282: 3279: 3277: 3274: 3272: 3269: 3267: 3264: 3262: 3259: 3257: 3254: 3252: 3249: 3247: 3244: 3242: 3239: 3237: 3234: 3232: 3229: 3227: 3224: 3222: 3218: 3215: 3213: 3210: 3208: 3205: 3203: 3202:Compucolor II 3200: 3198: 3195: 3193: 3190: 3188: 3185: 3183: 3180: 3178: 3175: 3173: 3170: 3168: 3165: 3163: 3160: 3158: 3157:Acorn RISC OS 3155: 3153: 3150: 3148: 3145: 3143: 3140: 3138: 3135: 3133: 3130: 3128: 3125: 3123: 3120: 3119: 3117: 3113: 3107: 3104: 3102: 3099: 3097: 3094: 3092: 3089: 3087: 3086:8-bit Turkish 3084: 3082: 3079: 3075: 3072: 3070: 3067: 3065: 3062: 3060: 3057: 3055: 3052: 3050: 3047: 3045: 3042: 3040: 3037: 3035: 3032: 3030: 3027: 3026: 3025: 3022: 3020: 3017: 3016: 3014: 3011: 3007: 3003: 2997: 2994: 2992: 2989: 2988: 2986: 2983: 2979: 2973: 2970: 2968: 2965: 2963: 2960: 2958: 2955: 2953: 2950: 2948: 2945: 2943: 2940: 2938: 2935: 2933: 2930: 2928: 2925: 2923: 2920: 2918: 2915: 2913: 2910: 2908: 2905: 2903: 2900: 2898: 2895: 2893: 2890: 2887: 2883: 2880: 2878: 2875: 2873: 2870: 2869: 2867: 2865: 2861: 2855: 2852: 2850: 2847: 2845: 2842: 2840: 2837: 2835: 2832: 2830: 2827: 2825: 2822: 2820: 2817: 2815: 2812: 2810: 2807: 2805: 2802: 2800: 2797: 2795: 2792: 2790: 2787: 2785: 2782: 2780: 2777: 2775: 2772: 2770: 2767: 2765: 2762: 2760: 2757: 2755: 2752: 2751: 2749: 2747: 2743: 2737: 2734: 2732: 2729: 2727: 2724: 2722: 2719: 2717: 2714: 2712: 2709: 2707: 2704: 2702: 2699: 2697: 2694: 2692: 2689: 2687: 2684: 2682: 2679: 2677: 2674: 2672: 2669: 2667: 2664: 2662: 2659: 2657: 2654: 2652: 2649: 2647: 2644: 2642: 2639: 2637: 2634: 2632: 2629: 2627: 2624: 2622: 2619: 2617: 2614: 2612: 2609: 2607: 2604: 2602: 2599: 2597: 2594: 2592: 2589: 2587: 2584: 2582: 2579: 2577: 2574: 2572: 2569: 2567: 2564: 2562: 2559: 2557: 2554: 2552: 2549: 2547: 2544: 2542: 2539: 2537: 2534: 2532: 2529: 2527: 2524: 2522: 2519: 2517: 2514: 2512: 2509: 2507: 2504: 2502: 2499: 2497: 2494: 2492: 2489: 2487: 2484: 2482: 2479: 2477: 2474: 2472: 2469: 2467: 2464: 2462: 2459: 2457: 2454: 2452: 2449: 2447: 2444: 2442: 2439: 2437: 2434: 2433: 2431: 2427: 2421: 2418: 2416: 2413: 2411: 2408: 2406: 2403: 2401: 2398: 2396: 2393: 2391: 2388: 2386: 2383: 2381: 2378: 2376: 2373: 2371: 2368: 2366: 2363: 2361: 2358: 2356: 2353: 2351: 2348: 2346: 2343: 2341: 2338: 2336: 2333: 2331: 2328: 2326: 2323: 2321: 2318: 2316: 2313: 2311: 2308: 2306: 2303: 2301: 2298: 2296: 2293: 2291: 2288: 2286: 2283: 2281: 2278: 2277: 2275: 2271: 2266: 2260: 2257: 2255: 2254:ISO/IEC 10367 2252: 2250: 2247: 2246: 2244: 2242: 2238: 2232: 2229: 2227: 2224: 2222: 2219: 2217: 2214: 2212: 2209: 2207: 2204: 2202: 2199: 2197: 2194: 2192: 2189: 2187: 2184: 2182: 2179: 2177: 2174: 2172: 2169: 2167: 2164: 2162: 2159: 2157: 2154: 2152: 2149: 2147: 2144: 2142: 2139: 2137: 2134: 2132: 2129: 2127: 2124: 2122: 2119: 2117: 2114: 2112: 2109: 2107: 2104: 2102: 2099: 2097: 2094: 2092: 2089: 2087: 2084: 2082: 2079: 2078: 2076: 2072: 2066: 2063: 2061: 2058: 2056: 2053: 2051: 2048: 2046: 2043: 2041: 2038: 2034: 2031: 2029: 2026: 2025: 2024: 2021: 2020: 2018: 2014: 2006: 2003: 2001: 1998: 1996: 1993: 1991: 1988: 1987: 1985: 1981: 1978: 1976: 1973: 1972: 1970: 1966: 1963: 1962: 1960: 1956: 1953: 1951: 1948: 1946: 1943: 1941: 1938: 1936: 1933: 1931: 1928: 1926: 1923: 1921: 1918: 1916: 1913: 1911: 1908: 1906: 1905:-5 (Cyrillic) 1903: 1901: 1898: 1896: 1893: 1891: 1888: 1886: 1883: 1882: 1880: 1879: 1877: 1875: 1871: 1865: 1862: 1856: 1853: 1851: 1848: 1847: 1845: 1843: 1840: 1838: 1835: 1833: 1830: 1829: 1828: 1824: 1820: 1817: 1815: 1812: 1808: 1805: 1804: 1803: 1800: 1798: 1795: 1791: 1788: 1784: 1781: 1779: 1776: 1774: 1771: 1769: 1766: 1765: 1764: 1761: 1759: 1756: 1755: 1754: 1751: 1750: 1748: 1744: 1740: 1733: 1728: 1726: 1721: 1719: 1714: 1713: 1710: 1703: 1700: 1699: 1695: 1679: 1676: 1671: 1666: 1662: 1661: 1654: 1651: 1639: 1635: 1629: 1626: 1618: 1611: 1610: 1602: 1599: 1593: 1590: 1582: 1575: 1574: 1566: 1563: 1552: 1549: 1544: 1539: 1535: 1534: 1527: 1524: 1517: 1513: 1510: 1508: 1505: 1503: 1500: 1498: 1495: 1492: 1489: 1488: 1484: 1482: 1480: 1476: 1471: 1469: 1465: 1462:Non-erasable 1460: 1458: 1457:Biuro Szyfrów 1454: 1450: 1446: 1441: 1439: 1435: 1431: 1426: 1422: 1417: 1415: 1411: 1407: 1402: 1400: 1392: 1390: 1388: 1384: 1380: 1375: 1373: 1369: 1365: 1361: 1357: 1351: 1349: 1345: 1339: 1337: 1333: 1329: 1324: 1322: 1318: 1314: 1310: 1305: 1303: 1299: 1294: 1292: 1286: 1280: 1278: 1276: 1272: 1268: 1263: 1261: 1260:punched cards 1253: 1251: 1248: 1243: 1240: 1236: 1231: 1230:right-to-left 1227: 1226:left-to-right 1223: 1220: 1216: 1212: 1208: 1200: 1198: 1189: 1186: 1178: 1175:February 2012 1168: 1164: 1160: 1154: 1153: 1149: 1144:This section 1142: 1138: 1133: 1132: 1126: 1124: 1122: 1118: 1114: 1109: 1104: 1100: 1097: 1092: 1089: 1085: 1080: 1074: 1070: 1066: 1062: 1054: 1037: 1033: 1029: 1025: 1022: 1019: 1016: 1012: 1009: 1006: 1003: 1000: 999: 998: 996: 992: 984: 982: 980: 974: 966: 964: 962: 954: 946: 938: 930: 918: 914: 903: 899: 896: 892: 888: 884: 881: 877: 873: 869: 861: 857: 853: 837: 833: 818: 814: 799: 795: 793:and variants. 792: 776: 772: 757: 753: 738: 734: 719: 715: 712: 708: 704: 688: 684: 683: 682: 675: 672: 668: 665: 662: 660: 657: 653: 650: 647: 645: 642: 638: 635: 632: 630: 627: 623: 620: 617: 615: 612: 608: 605: 602: 600: 597: 593: 590: 587: 585: 582: 578: 575: 572: 570: 567: 563: 560: 557: 555: 552: 548: 545: 542: 540: 537: 533: 530: 527: 525: 522: 518: 515: 512: 510: 507: 503: 500: 497: 495: 492: 488: 485: 482: 480: 477: 473: 470: 467: 465: 462: 458: 455: 452: 450: 447: 443: 440: 437: 435: 432: 428: 419: 418: 412: 410: 405: 403: 399: 394: 392: 380: 376: 372: 364: 360: 352: 347: 345: 341: 337: 334: 326: 319:ASCII code 27 317: 310: 301: 294: 292: 289: 287: 283: 278: 276: 272: 268: 264: 259: 257: 253: 243: 234: 230: 227:This section 225: 222: 218: 217: 211: 209: 203: 199: 195: 191: 187: 186: 181: 177: 173: 172:character set 169: 165: 161: 157: 153: 149: 138: 135: 127: 116: 113: 109: 106: 102: 99: 95: 92: 88: 85: –  84: 80: 79:Find sources: 73: 69: 63: 62: 57:This article 55: 51: 46: 45: 40: 33: 19: 3652:ISO/IEC 6429 3633: 3609:Stanford/ITS 3596: 3530:ARIB STD-B24 3311:Sega SC-3000 3212:DEC RADIX 50 2249:ISO/IEC 8859 2241:ISO/IEC 2022 1986:Adaptations 1945:-14 (Celtic) 1940:-13 (Baltic) 1930:-10 (Nordic) 1925:-9 (Turkish) 1874:ISO/IEC 8859 1681:. Retrieved 1659: 1653: 1642:. Retrieved 1638:the original 1628: 1608: 1606:"4.8 Name". 1601: 1592: 1572: 1565: 1554:. Retrieved 1532: 1526: 1475:file systems 1472: 1461: 1448: 1442: 1424: 1418: 1413: 1410:asynchronous 1409: 1403: 1396: 1376: 1352: 1340: 1325: 1306: 1295: 1287: 1284: 1264: 1257: 1244: 1204: 1196: 1181: 1172: 1157:Please help 1145: 1105: 1101: 1093: 1081: 1059:ASCII-based 1058: 988: 976: 942: 798:vertical tab 791:UNIX systems 680: 406: 395: 348: 312: 290: 279: 260: 250: 240:January 2009 237: 233:adding to it 228: 193: 189: 183: 163: 159: 155: 145: 130: 121: 111: 104: 97: 90: 78: 66:Please help 61:verification 58: 18:Control code 3371:ZX Spectrum 3326:Sinclair QL 3162:Amstrad CPC 3081:8-bit Greek 3008:terminals ( 2721:Iran System 2273:("scripts") 1920:-8 (Hebrew) 1910:-6 (Arabic) 1807:ISO/IEC 646 1449:all-bits-on 1414:Synchronous 1277:protocols. 1219:out-of-band 1215:Baudot code 1069:bitwise AND 385:through 159 267:Murray code 263:Baudot code 3657:JIS X 0211 3565:ISO-IR-169 3418:UTF-EBCDIC 2984:code pages 2711:CSX+ Indic 2315:Devanagari 2270:Code pages 2191:LST 1590-4 2161:JIS X 0213 2156:JIS X 0212 2151:JIS X 0208 2146:JIS X 0201 2111:GOST 10859 2033:CCCII/EACC 1935:-11 (Thai) 1915:-7 (Greek) 1850:background 1773:Wabun/Kana 1683:2013-11-03 1644:2010-10-08 1556:2023-04-05 1453:paper tape 1443:Code 127 ( 1002:Code point 997:encoding: 967:In Unicode 961:Unix shell 705:including 344:ANSI X3.64 269:added the 256:Morse code 168:code point 94:newspapers 3710:MICR code 3545:IEC-P27-1 3523:ISO-IR-68 3428:DIN 91379 3306:SAM Coupé 3241:GSM 03.38 3231:Galaksija 2726:Kamenický 2706:CSX Indic 2415:Ukrainian 2201:Shift JIS 2181:KS X 1002 2176:KS X 1001 2101:DIN 66003 2096:CNS 11643 1864:Transcode 1842:ITU T.101 1768:Non-Latin 1479:filenames 1146:does not 1121:scancodes 1088:caps lock 1061:keyboards 902:Control-Z 883:protocols 878:, and by 817:form feed 775:line feed 737:backspace 363:CR and LF 325:Bob Bemer 275:line feed 273:(CR) and 176:character 148:computing 3749:Category 3715:Mojibake 3570:ISO 2033 3535:Fieldata 3513:ASMO 449 3423:GB 18030 3383: / 3331:Teletext 3321:Sharp MZ 3251:HP FOCAL 3246:HP Roman 3177:Atari ST 3167:Apple II 2701:CS Indic 2395:Romanian 2370:Keyboard 2350:Gurmukhi 2345:Gujarati 2335:Georgian 2310:Cyrillic 2305:Croatian 2280:Armenian 2186:LST 1564 2171:KPS 9566 2131:GB 18030 2126:GB 12052 2121:GB 12345 2106:ELOT 927 2040:ISO 5426 2000:Estonian 1837:ITU T.61 1827:Teletext 1823:Videotex 1797:Fieldata 1783:Cyrillic 1702:ISO IR 1 1617:Archived 1581:Archived 1485:See also 1397:Code 7 ( 1030:, as in 1015:ISO 2047 885:such as 379:ISO 8859 295:In ASCII 286:teletype 3604:SEASCII 3598:Mojikyō 3585:KOI8-RU 3508:ABICOMP 3381:Unicode 3291:PETSCII 3281:NEC APC 3217:DEC MCS 3172:ATASCII 3069:Swedish 3054:Finnish 3039:Spanish 2731:Mazovia 2696:ABICOMP 2405:Turkish 2360:Iceland 2268:Mac OS 2211:TIS-620 2116:GB 2312 2091:BraSCII 2081:ArmSCII 1819:Teletex 1778:Chinese 1167:removed 1152:sources 1111:"Dumb" 1065:Control 985:Display 955:, EOT, 947:, ETX, 931:only), 876:Windows 398:Unicode 212:History 166:) is a 108:scholar 3614:Symbol 3590:KOI8-U 3580:KOI8-R 3448:TACE16 3438:CESU-8 3433:BOCU-1 3413:UTF-32 3408:UTF-16 3351:WISCII 3341:TRS-80 3261:SQUOZE 3256:HP RPL 3096:Hebrew 3091:SI 960 3059:French 2982:EBCDIC 2872:CER-GS 2355:Hebrew 2330:Gaelic 2295:Celtic 2285:Arabic 2231:YUSCII 2221:VISCII 2206:SI 960 2196:PASCII 2045:5426-2 2023:MARC-8 1758:Needle 1321:Ctrl-D 1317:Ctrl-C 1313:Ctrl-Z 1269:  1073:binary 1050:, etc. 917:escape 915:0x1B ( 900:0x1A ( 893:, and 834:0x0D ( 815:0x0C ( 796:0x0B ( 773:0x0A ( 754:0x09 ( 735:0x08 ( 716:0x07 ( 685:0x00 ( 340:cursor 110:  103:  96:  89:  81:  3685:CCSID 3558:8-bit 3553:7-bit 3549:INIS 3403:UTF-8 3398:UTF-7 3393:UTF-1 3271:LMBCS 3207:CP/M+ 3049:Dutch 3034:Swiss 2716:CWI-2 2420:VT100 2390:Roman 2385:Ogham 2365:Inuit 2340:Greek 2226:VSCII 2216:TSCII 2166:KOI-7 2141:ISCII 2136:HKSCS 2028:ANSEL 1990:Welsh 1814:BCDIC 1802:ASCII 1763:Morse 1620:(PDF) 1613:(PDF) 1584:(PDF) 1577:(PDF) 1473:Many 1432:; 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Index

Control code
Non-printing character in word processors
Escape character

verification
improve this article
adding citations to reliable sources
"Control character"
news
newspapers
books
scholar
JSTOR
Learn how and when to remove this message
computing
telecommunications
code point
character set
character
in-band signaling
graphic characters
space
ASCII

adding to it
Procedural signs
Morse code
Baudot code
Murray code
carriage return

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