What is the generic term for domain & range?

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swampwiz
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As I understand it, there are the terms:

domain - variables that are input to a function

range - the variable that is output to a function

This works well in a canonical single equation system like z = f( x , y ), but breaks down in an implicit function or set of equations. I was wondering what the proper term is for all the variables that exist in any system of equations - whether they happen to be input or output for any particular equation.