What does OSW stand for?

Oblique Shock Wave

Office of Saline Water - Later, OWRT - Department of the Interior

Office of Secretary of War - Obsolete

Office of Solid Waste - Environmental Protection Agency (EPA)

Office of Surface Water - United States Geological Survey (GIS)

Office Saline Water (SAUS)

Old Swedish - Language, etc.

Olique Shock Wave (SAUS)

Operational Switching Unit

Operations Support Wing - NASA

Orbital Weapon System (SAUS)

Order of the Sacred Word - Affiliate of the magical society, Aurum Solis

Ordnance Weapon Systems (SAUS)

Oswego, KS - Location identifier - FAA (FAAL)

Oswestry - British depot code

Wittenberg University, Springfield, OH - Library symbol - Library of Congress (LCLS)