[1] Optical Protection Socket

[2] On-line Process Synthezier (->"IEEE Standard Dictionary")

[3] Operational Paging System (->"IEEE Standard Dictionary")

[4] Office of Public Services (UK)

[5] Off-Premises Station

[6] Operations

[7] Operations Sequence (->"NASA Acronym List")

[8] Orbiter Project Schedules (->"NASA Acronym List")