(Internet) A metadata tag, signaled by a preceding hash sign (#), used to label content. / (Internet, informal) The hash sign itself, when used as part of a hashtag.

(organic chemistry) Two substituents in a molecule

(vulgar) plural of fucking / (demoscene) Public abuse directed at rival demosceners, often included in the scrolltext of a demo; the negative equivalent of greets.

plural of colobodontid