The name of the Latin-script letter S.

(psychology) id

(sexuality, euphemistic) sadism, sadist / (colloquial) dominant personality

(education) highest academic grading in the S-A-B-C-F scale / (chiefly video games) S, the highest rank or grade (above A) commonly used in ranking systems in video games

small size

(Internet slang) Alternative spelling of さん (san)

(collectible card games, video games) super special rare, or any synonymous variations

SMS

(fiction) genderswap; genderbend; sex change

(fiction) to undergo a genderswap, genderbend, or sex change