Office of Science and Technology 
Office of the Secretary of Transportat… 
Orbiter Support Trolley 
Originating Station Treatment 
Operations Support Team 
Order Ship Time 
OSTIGLIA ITALIA 
Ontario Student Transcript 
Observational Sequence Table 
Office of Secure Transportation 
Office of Special Trustee 
operational suitability test 
Operational Support Team 
Optical Space Telescope 
Original Soundtrack 
Outer Space Treaty 
out-of-school-time 
Airline Alania 
AUSTRIA FUND, INC. 
IATA code for Ostend-Bruges Internatio… 
object sorting test 
Object Storage Target 
Oblate School of Theology 
Ocean Surface Temperature 
Office for Science and Technology 
Office of Science and Techology 
Office of Standards and Technology 
Office of State Treasurer 
Office of the Secretary of Tranportati… 
Office of the Special Trustee