Any high wall for defense.
In fortification: an indented parapet, formed by a series of rising members called cops or merlons, separated by openings called crenelles or embrasures, the soldier sheltering himself behind the merlon while he fires through the embrasure or through a loophole in the battlement.
The towering roof of heaven.
A sturdy military fortification, often of concrete, with gunports.
A reinforced building from which to control hazardous operations, such as an explosion or a rocket launch.