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In fan fiction, "!" is used to signify a defining quality in a character, as in romantic!Draco from Harry Potter fandom. Almost always the character in question is a canon character, and most often the quality is one that is unusual, or non-canon. Occassionally, the "!" notation will describe a physical appearance thought to trigger certain reactions, as in shirtless!Vaughn from Alias. Origin unknown.
In mathematics the symbol represents the factorial operation. "" means "the product of the integers from 1 to ". For example, (read four factorial) is 4 × 3 × 2 × 1 = 24. To avoid problems in some sums involving factorials, is defined as 1, which is a neutral element in multiplication, not multiplied by anything.
In computer programming, the exclamation mark corresponds to Unicode and ASCII character 33, or 0x0021.
Several computer languages use "!" for a variety of special meanings, most importantly, logical negation, e.g. A != B means "A is not equal to B." In this context, the exclamation is named the bang character, other programmers call it a shriek. Invented in the US it is claimed that the first term is from Unix and the second from Stanford or MIT. In the BBC Basic programming language it is called a pling and is used to reference a 32-bit word.
See also: shebang
In the Geek Code, "!" is used before a letter to denote that the geek refuses to participate in the topic at hand.
In chess notation "!" denotes a good move and "!!" an excellent move.
Punctuation Typography