- A photograph, printed in a magazine or other publication, of a sexually attractive person (often nude or provocatively dressed), and intended to be removed and pinned up on a wall.
- The person so depicted.
- (figuratively) figurehead, person who represents an idea, cause etc.
From pin up, as such a photograph is often removed from the publication in which it is printed and pinned up on a wall.
- To put (e.g. a sheet of paper) on display, using a pin.