(South Africa, military) Initialism of South African Defence Force.

(fandom slang) Fan fiction focusing on the imagined activities of a real musician or musicians.

(mineralogy) A triclinic-pinacoidal mineral containing calcium, hydrogen, iron, manganese, oxygen, and phosphorus.

(linguistics) An existing acronym which has been redefined as a nonacronymous name, severing its link to its previous meaning.