Three standing stones, one at the back, two at the sides like an unroofed sentry-box
A cove is made of three or more standing stones close to each other. They form a roughly rectangular structure open in one direction.
Cove is a term used to describe a tightly concentrated group of large standing stones found in Neolithic and Bronze Age England. Coves are square or rectangular in plan and seem to have served as small enclosures within other henge, stone circle or avenue features. They consist of three or four orthostats placed together to give the impression of a box.