Original SoundTrack, ie the music of an anime or video game, including all the songs.

Original Sound Track; the background music of an anime production, including all songs.

Music from an anime released on CD (Original Soundtrack). taku A fan of Anime/Manga in the U.S. In Japan, otaku is a geek.

Not strictly a warez term this one, but one that you are likely to come across while searching for MP3 music. It stands for original soundtrack (movie music).

Observatoire des Sciences et des Techniques (FR)

Office of the Secretary of Transportation. OST

Office of Science and Technology

Office of State Treasurer See: Benefit Issuances