Noun
(orthodontics) A small hook for attaching elastic bands on the internal side of braces fixed to the upper teeth.
(typography, rare) = háček (when it takes the form of a prime)
(typography, pre-1989 IPA) A hamiform diacritic () formerly used to mark consonantal palatalisation; superseded by the superscript jay: (ʲ).
Source: en.wiktionary.org