OSL

OSL is a three-letter acronym that could mean:

Ongamenet Starleague, a major tournament for StarCraft professional competitors in South Korea
Ontario Soccer League, a semi-pro soccer league in Ontario, Canada
Open Software License, an open-source software license
Open Source Lab, the Open Source research facility at Oregon State University
Optically stimulated luminescence, a method of measuring doses from ionizing radiation
Orbiting Solar Laboratory
Oregon Short Line Railroad

OSL may also refer to:

OSL, the IATA Airport code for Oslo Airport, Gardermoen
OSL, the ICAO Airline Designator for Sosoliso Airlines

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