(slang) A person who is obsessed with fixing grammatical errors.

(typography, historical) Synonym of slash ⟨ / ⟩ in its former use as a form of comma.

(typography, historical) Alternative form of scratch comma.

plural of comma-point

(typography, obsolete) Synonym of comma ⟨,⟩.

(category theory) A category built out of a pair of functors that have the same codomain.

plural of comma category

plural of comma bacillus

(programming, Perl) The operator =>, used in declaring hashes.

(music) A small comma-type interval between two musical notes, equal to the frequency ratio 81:80 (= 1.0125) or around 21.51 cents.