Cantilever

A rigid structural element, such as a beam or a plate, anchored at only one end to a (usually vertical) support from which it is protruding; this could also be a perpendicular connection to a flat vertical surface such as a wall.

Cantilever construction allows for overhanging structures without external bracing, in contrast to constructions supported at both ends with loads applied between the supports, such as a simply supported beam found in a post and lintel system.

Cricket

A cricket, or saddle, is a ridge structure designed to divert water on a roof around the high side of a chimney or the transition from one roof area to another; the cricket is normally the same pitch as the rest of the roof, but not always.

Cupola

A small dome, especially a small dome on a drum on top of a larger dome, adorning a roof or ceiling.