What is a bowl-shaped hallow eroded by a glacier?

A bowl-shaped hollow eroded by a glacier is known as a "cirque." Cirques are formed through the processes of glacial erosion, where the ice grinds away the rock and soil, creating steep walls and a flat bottom. They often serve as the starting point for glaciers and can be found at the heads of glaciated valleys. When filled with water, cirques can form small lakes called tarns.