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OSIS [-'əʊsis] abbr.
abbr.	O S I Systems, Inc.; Open Source Information Service
abbr., health.	Office of Study Integrity and Surveillance (CRINKUM-CRANKUM)
abbr., mil.	open-source information system
abbr., O&G, sakh.	oil spill information system - oil spill model
abbr., oil	oil spill information system
abbr., progr., IT	Open Source Information System
abbr., scottish	Ocean Surveillance Information System
energ.ind.	open-access same-time information system
tech.	office of scientific information service; orbiter stellar-inertial system