equalizer in Finnish

A device that balances various quantities.

(music, electronics) An electronic audio device for altering the frequencies of sound recordings.

(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 factors through this limiting morphism; and moreover such factorization is unique.

(North America, slang) A weapon, usually a blackjack or gun.