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OSR may refer to: * Leoš Janáček Airport Ostrava's IATA code * Oil-Steam Ratio, the ratio of oil produced to steam injected, in the extraction of petroleum * Oilseed rape, (''Brassica napus''), also known as rapeseed * Old School Revival, also known as Old School Renaissance, a movement within Dungeons and Dragons and Tabletop role-playing games * On-Stack-Replacement, in Java HotSpot virtual machines, the conversion of a running function’s interpreter frame into a just-in-time (JIT) frame in the middle of that method * Ontario Southland Railway, a short line railway operating in Southern Ontario, Canada * Ontario Student Record * Open-source religion, belief systems created through open-source methodologies * Open Space Ratio, the ratio of unbuilt to built terrain, in urban planning * Operation Summer Rains, also known as the 2006 Israel–Gaza conflict * Operational sex ratio, ratio of reproductively available males to females * Operational System Review, in air traffic control * Optical solar reflector, a radiator material for space craft * Outgoing Shortwave Radiation, in atmospheric physics * Owasippe Scout Reservation, a Boy Scout camp in Twin Lake, Michigan * Texas State Highway OSR, a section of the Old San Antonio Road ==See also== * BDTH2 or OSR#1, an industrial chelation agent marketed to parents of children with autism * OSRIC or Old School Reference and Index Compilation, a ''Dungeons & Dragons'' retro-clone 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「OSR」の詳細全文を読む スポンサード リンク
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