A pintail is a type of dabbling duck with a characteristic pointed tail, specifically referring to the northern pintail, anas acuta, which is a dabbling duck found in the northern hemisphere.

A pin-tailed snipe, Gallinago stenura.

Any of various species of libellulid dragonfly of the genus Acisoma, endemic to Africa and Asia.

(engineering) The end of a fastening pin or mandrel on a Huckbolt or pop rivet that is broken off when installation is complete.

(surfing) A surfboard with a pointed back end.