A figure in the form of a crescent, bounded by two intersecting arcs of circles.

a crescent-shaped portion of a plane or sphere bounded by two arcs of circles

a figure in a plane that is bounded by two circular arcs as shown below

A fit of lunacy or madness; a period of frenzy; a crazy or unreasonable freak.

a web agency specialized in the creation of high impact internet sites and CDROMs as well as video postproduction and digital final cut

Anything in the shape of a half moon.