The head of a pin. (Frequently used in size comparisons.)
An ignorant, naive, foolish, or stupid person.
A telemark skier.
A human head that is unusually tapered or small, often due to microcephaly, or a person with that trait. Often promoted in freak shows as "human pinheads".
(pet stores) A newborn cricket used as food for pets.
(mycoculture) The immature juvenile fruiting body of a mushroom prior to its gills opening.