Question

what is the blak keys called on a paino

Answer 1

They are simply called black keys.

It is incorrect to call them sharps and flats because sharps and flats don't necessarily include black keys. C-flat, for example, is a white key. E-sharp is also white.

Answer 2

I'd say accidental keys.
The white keys are called natural keys.

Answer 3

I agree with thomaster!

Answer 4

accidentals, sharps and flats are called that sometimes.