English abbreviations from secnav to see
- SECNAV (United States Secretary of the Navy)
- SECNAVINST (Secretary of The Navy Instruction)
- SECOMP (Secure Communications Package)
- SECORD (Secure Cord Switchboard)
- SECRA (Secondary Radar Data Only)
- SECREL (SECRET Releasable)
- Secret squirrel stuff (Material classified above secret or compartmentalzed information.)
- SECS (Semiconductor Equipment Communications Standard)
- SECSTATE (Secretary of State)
- SECT (Staff Education Coordinating Team)
- SECTRANS (Secretary of Transportation)
- SECURE (Safe And Effective Communities And Understanding For Response To Emergencies)
- SED ((astrophyics terminology) Spectral Energy Distribution)
- SEDA (South Eastern Discotheque Association)
- SEDAS (Spurious Emission Detection Acquisition System)
- SEDC (Southern Economic Development Council)
- SEDHI (Sedimentary History)
- SEDIM (Sedimentology)
- SEDL (Sedimentology Log)
- SEDO (Search Engine for Domain Offers)
- SEDOR (Spin Echo DOuble Resonance)
- SEDRE (Sedimentology Report)
- SEDS ((organization) Students for the Exploration and Development of Space)
- SEE (Gillespie Field)