equalizer

One who makes equal; a balancer.
A device that balances various quantities.
(sports) A goal, run, point, etc. that equalizes the score.
An electronic audio device for altering the frequencies of sound recordings.
A device, such as a bar, for operating two brakes, especially a pair of hub brakes for an automobile, with equal force.
Any device for equalizing the pull of electromagnets.
A conductor of low resistance joining the armature ends of the series field coils of dynamos connected in parallel.
A sliding panel to preserve the lateral stability of an aeroplane.
(math) A set of arguments where two or more functions have equal values; the solution set of an equation.
(category theory) A morphism whose codomain is the domain of a parallel pair of morphisms and which forms part of the limit of that parallel pair. Equivalently, a morphism which equalizes a parallel pair of morphisms in a limiting way, which is to say that any other morphism which equalizes that parallel pair factor factors through this limiting morphism; and moreover such factorization is unique.
(North America) a weapon, usually a blackjack or gun