Kitten Heel
This is a low heel – the opposite of a stiletto or platform heel (although, technically “stiletto” refers to the narrowness of the heel, not the height, so a kitten heel could be considered a type of stiletto). They also tend to have a slight curve to the heel.
Why I Looked It Up
It came up on a show I was watching. A masculine lesbian complained –
They made me wear a kitten heel!