OST (plural OSTs)

Initialism of original soundtrack.
Coordinate term: UST

I really like the OST of that game.

original soundtrack

OST

(law, space science) Initialism of Outer Space Treaty: a treaty that represents the basic legal framework of international space law, signed in 1967.
- 2014, John G Sprankling, “Rights in Airspace and Outer Space”, in The International Law of Property, Oxford University Press, →ISBN, page 176:
  The most important source of space law is the 1967 Treaty on Principles Governing the Activities of States in the Exploration and Use of Outer Space, including the Moon and Other Celestial Bodies (OST).¹⁶ […] The OST is a product of the Cold War era when the United States and the Soviet Union—the only states with spacefaring capability—were bitter rivals, each fundamentally distrustful of the other.
Initialism of Open Skies Treaty.
(UK politics, historical) Initialism of Office of Science and Technology.

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