pushpin

noun

1. (countable)A small pin with a head made for gripping with the fingers, to be pushed into a bulletin board so as to pin papers to it; especially, such a pin with a cylindrical head.

   “My invention relates to improvements in what are termed “push-pins,” said pins being adapted to support one article upon another and being particularly employed for holding photographic films stretched upon a surface, such as a board, for drying and the like.”

   “An illustration showed a pair of scissors slicing off the leg of a doll […] stuck with pushpins.”

2. (archaic, uncountable)An old children's game where pins are placed on a table and each player tries to push his pin so as to cross the other's.

verb

1. (transitive)To fasten with a thumbtack.