Ceiling

Ceiling (noun)
 * 1) the upper part of a building (from the inside)
 * 2) a barrier through which certain peoples cannot pass.

Example:
 * 1) The Glass Celing, which prevents the rise of chicks to the top of the corporate ladder
 * 2) The Jemima Ceiling, which prevents brothers from being the head of a corporation that bears their non-threatening, un-sexual slave name