pintle

noun4

1. •
   A pin or bolt, usually vertical, which acts as a pivot for a hinge or a rudder.

   • The train had a searchlight mounted on a pintle on a flat car. — 2005
2. •
   An iron pin used to control recoil of a cannon or around which a gun carriage revolves.
3. •
   A pin on the buckle of a belt used to fit into the holes of the belt and hold it at the desired level of tightness.
4. •
   (dialect) The penis.