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Code 39 (also known as Alpha39, Code 3 of 9, Code 3/9, Type 39, USS Code 39, or USD-3) is a variable length, discrete barcode symbology defined in ISO/IEC 16388:2007. The Code 39 specification defines 43 characters, consisting of uppercase letters (A through Z), numeric digits (0 through 9) and a number of special characters ...
ASCII codes represent text in computers, telecommunications equipment, and other devices. ASCII has just 128 code points, of which only 95 are printable characters, which severely limit its scope. The set of available punctuation had significant impact on the syntax of computer languages and text markup.
A numeric character reference refers to a character by its Universal Character Set/Unicode code point, and a character entity reference refers to a character by a predefined name. A numeric character reference uses the format &#nnnn; or &#xhhhh; where nnnn is the code point in decimal form, and hhhh is the code point in hexadecimal form.
In HTML and XML, a numeric character reference refers to a character by its Universal Coded Character Set/Unicode code point, and uses the format: &#xhhhh;. or &#nnnn; where the x must be lowercase in XML documents, hhhh is the code point in hexadecimal form, and nnnn is the code point in decimal form.
This page was last edited on 20 January 2025, at 10:13 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
ASCII Code (DEC) ASCII Code (HEX) Latin capital letters: A,B, ... Z: 65 - 90 41 - 5A Latin small letters: a,b, ... z: 97 - 122 61 - 7A Numbers: 0,1, ... 9: 48 - 57 30 - 39 SPACE (space) 32 20 APOSTROPHE ' 39 27 LEFT PARENTHESIS (40 28 RIGHT PARENTHESIS) 41 29 PLUS SIGN + 43 2B COMMA, 44 2C HYPHEN-MINUS-45 2D FULL STOP. 46 2E SOLIDUS / 47 2F ...
Moved characters a bit to have * clearly separated from the others (it's not a true character in Code 39). Déplacé quelques caractères pour mettre clairement * de côté (ce n'est pas un vrai caractère en Code 39) 21:11, 25 June 2010: 625 × 1,425 (82 KB) JoostyBoy: Last one, centered the space barcode symbol and its description. 21:09, 25 ...
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.