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The ampersand, also known as the and sign, is the logogram &, representing the conjunction "and". It originated as a ligature of the letters of the word et ...
In logic, a set of symbols is commonly used to express logical representation. The following table lists many common symbols, together with their name, how they should be read out loud, and the related field of mathematics.
In this table, The first cell in each row gives a symbol; The second is a link to the article that details that symbol, using its Unicode standard name or common alias.
HTML and XML provide ways to reference Unicode characters when the characters themselves either cannot or should not be used. 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.
The + sign is a simplification of the Latin: et (comparable to the evolution of the ampersand &). [7] The − may be derived from a macron ̄ written over m when used to indicate subtraction; or it may come from a shorthand version of the letter m itself. [8] From Johannes Widmann's book on "handy and pretty arithmetic for all merchants" [9] [10]
In high-level computer programming and digital electronics, logical conjunction is commonly represented by an infix operator, usually as a keyword such as "AND", an algebraic multiplication, or the ampersand symbol & (sometimes doubled as in &&). Many languages also provide short-circuit control structures corresponding to logical conjunction.
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