Operator

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In programming languages, an operator is an transaction which works on one or two (usually) data values(s) in some way to produce another value, which is then used in some way - perhaps as part of a larger expression in the program.

Operators which take a single data item are sometimes called 'unary', and those which take two can be called 'binary'.

An example of unary operator would be a bit-wise inversion, and binary operators include the usual arithmetic operations +, /, etc.