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The symbol # is an octothorpe known variously in English-speaking regions as the number sign, [1] hash, [2] or pound sign. [3] The symbol has historically been used for a wide range of purposes including the designation of an ordinal number and as a ligatured abbreviation for pounds avoirdupois – having been derived from the now-rare ℔ .
Chris Messina suggested using hashtags on Twitter. The number sign or hash symbol, #, has long been used in information technology to highlight specific pieces of text. In 1970, the number sign was used to denote immediate address mode in the assembly language of the PDP-11 [12] when placed next to a symbol or a number, and around 1973, '#' was introduced in the C programming language to ...
Hash mark (sports), a marking on hockey rinks and gridiron football fields; Hatch mark, a form of mathematical notation; Number sign (#), also known as the hash, hash mark, or (in American English) pound sign; Service stripe, a military and paramilitary decoration; Tally mark, a counting notation; Checkmate symbol in chess
Names of many computer terms, especially computer applications, often relate to the function they perform, e.g., a compiler is an application that compiles (programming language source code into the computer's machine language). However, there are other terms with less obvious origins, which are of etymological interest.
It is also called sharp-exclamation, sha-bang, [1] [2] hashbang, [3] [4] pound-bang, [5] [6] or hash-pling. [ 7 ] When a text file with a shebang is used as if it were an executable in a Unix-like operating system, the program loader mechanism parses the rest of the file's initial line as an interpreter directive .
This page was last edited on 15 April 2004, at 16:20 (UTC).; Text is available under the
A small phone book as a hash table. In computer science, a hash table is a data structure that implements an associative array, also called a dictionary or simply map; an associative array is an abstract data type that maps keys to values. [2]
Many computer fonts consist of glyphs that are indexed by the numerical code of the corresponding character. With the advent and widespread acceptance of Unicode [5] and bit-agnostic coded character sets, [clarification needed] a character is increasingly being seen as a unit of information, independent of any particular visual manifestation.