SS
- ss — (s) Swati language (ISO 639-1 code)
- SS
- (s) Sand Storm (METAR Code)
- (p) Schutzstaffel (German, roughly "Protection Squadron"; Nazi elite Praetorian guard)
- (i) U.S. Secret Service
- Spanish Ship
- Stainless steel
- Stockholm Skins
- (s) Submarine (US Navy hull classification)
- (i) Super Sport
- Surface-to-Surface (missile)
- SSA
- (s) Cargo Submarine (US Navy hull classification)
- (i) Social Security Administration (U.S.)
- Statistics South Africa
- SSB — (a) Single-sideband modulation
- SSB — (i) Sacramento Sustainable Business
- SSBN — (s) Nuclear-Powered Ballistic Missile Submarine (US Navy hull classification)
- SSC
- (i) Safe, Sane, Consensual (SM phrase)
- Secondary Somatosensory Cortex
- Smaller-Scale Contingency
- U.S. Army Soldiers System Center (Natick, Massachusetts)
- Superconducting Super Collider
- SSCCATAGAPP — Singles, Seniors, Childless Couples, And Teens And Gays Against Parasitic Parents (fictional organization from The Simpsons)
- SSD
- (i) Solid-state drive
- (s) South Sudan (ISO 3166 trigram)
- SSDC — (i) U.S. Space and Strategic Defense Command
- SSDD
- (i) Same Shit, Different Day
- Single-Sided Double-Density (floppy disk)
- SSE
- (s) South South-East
- (i) Streaming SIMD Extensions
- SSG — (s) Guided Missile Submarine (retired US Navy hull classification)
- SSGN — (s) Nuclear-Powered Guided Missile Submarine (US Navy hull classification)
- SSH — (i) Saffir-Simpson Hurricane scale
- SSK — (s) Hunter-Killer Submarine (retired US Navy hull classification)
- SSKP — (i) Single-Shot Kill Probability
- SSL — (i) Secure Sockets Layer
- SSM — (i) Surface-to-Surface (Guided) Missile
- SSN
- (s) Nuclear-Powered Attack Submarine (US Navy hull classification)
- (i) SIM Serial Number
- Social Security Number (U.S.)
- Socialist Solidarity Network
- Subsystem number (SCCP, SS7)
- SSNW — (i) Same Shit, New Wrapping
- SSO — (s) Submarine Oiler (retired US Navy hull classification)
- SSP — (s) Submarine Transport (retired US Navy hull classification)
- SSR
- (s) Radar Picket Submarine (retired US Navy hull classification)
- (i) Solid State Recorder
- SSRI
- (i) Selective Serotonin Reuptake Inhibitor
- Social Systems Research Institute
- SSRN
- (i) Social Science Research Network
- (s) Nuclear-Powered Radar Picket Submarine (retired US Navy hull classification)
- SSS
- (i) Siding Spring Survey
- Side Side Side (an acronym for remembering congruent triangles)
- (i) Sigue Sigue Sputnik (band)
- S/SSM — (i) Surface-to-Subsurface Missile
- SST
- (i) SuperSonic Transport
- (s) Training Submarine (US Navy hull classification)
- Saturated Suction Temperature (refrigeration cycles)
- SSTO — (i) Single-Stage To Orbit
- SSV — (i) Soft-Skinned Vehicle (i.e., unarmoured)
- ssw — (s) Swati language (ISO 639-2 code)
- SSW — (s) South South-West
Read more about this topic: List Of Acronyms And Initialisms: S