noun: (networking) Initialism of Open Systems Interconnection. An International Standard ISO/IEC 7894:1994(E) subtitled Basic Reference Model. A four-part document that contains a formal description of an idealized computer network architecture. The document is also published as ITU-T Recommendation X.200
noun: (aviation, travel industry) Initialism of Other Supplementary Information. A message sent to an airline by an agent, in a standardised format, advising relevant information such as being a VIP, language difficulty, or passport information.
noun: (software, organisation) Initialism of Open Source Initiative.
noun: (US politics) Initialism of Office of Special Investigations.
