A shallow recess, especially one in a wall to display a statue or other ornament
A comfortable or suitable position in life or employment
a niche in the wall
That resembles a niche.
A small, specialized market for a particular product or service
(In a mosque) a niche in the centre of a sanctuary wall, indicating the direction of Mecca.
= ecological niche.
The business of promoting and selling a product or service to a specialized segment of a market