<Li> In Scheme, #is the prefix for certain syntax with special meaning . </Li> <Li> In Standard ML, #, when prefixed to a field name, becomes a projection function (function to access the field of a record or tuple); also, #prefixes a string literal to turn it into a character literal . </Li> <Li> In Mathematica syntax, #, when used as a variable, becomes a pure function (a placeholder that is mapped to any variable meeting the conditions). </Li> <Li> In LaTeX, #, when prefixing a number, references an arguments for a user defined command . For instance \ newcommand (\ code) (1) (\ texttt (#1)). </Li>

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