Orillon

At the lower edge of the 1908 OS map of the Flat Bastion in Gibraltar is an orillon covering a retired flank and the Prince Edward's Gate in the Charles V Wall.
The Flat Bastion (upper) and South Bastion (lower) on the Charles V Wall. Each has an orillon and a retired flank.

An orillon, also known as an orillion, is an architectural element of a military fortification. The ear-shaped projection of masonry provided defense for guns and soldiers at the flank of a bastion. However, an orillon could also shield a city gate.