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The hyphen symbol is used in math as the subtraction operator when entering a math expression for computation and for typesetting. Typically, the symbol is used in an expression like this:
5 - 3
In plain language, this expression represents five minus three. Note, when typsetting math the resulting symbol is actually the minus symbol.
The minus symbol is an arithmetic operator used to represent subtraction.
Subraction is a basic arithmetic operation of taking away one number from another number.