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OSN abbr.
abbr.	Office System Node (IBM, DIA, OA); Open Systems Network
abbr., comp., net., IT	Original Senshi Network
abbr., el.	optical shuttle node; optical subscriber network; optical switching network; output sequential number
abbr., IT	Operand Segment Number
abbr., med.	Ocular Surgery News; optical synchronous network
abbr., media.	Orion Syndicate Network
abbr., mil., avia.	operating system nucleus
abbr., nautic., scient.	Ocean Science News
abbr., neurol.	olfactory sensory neuron
abbr., O&G	open-specification naphtha (masizonenko)
abbr., org.name.	Nutrition Advisory Office
abbr., scottish	Office of the Secretary of the Navy (USA)
abbr., sec.sys., IT	Operator Security Number
abbr., space	operation support network; output switch network
abbr., st.exch.	Output Sequence Number (aldrignedigen)