• S : smiling
• S Georgia Cormorant
• S.I. units
• SA : Salvation Army
• SB : smiling back
• SBB modulation
• SBM : Stop bugging me!
• SCNR : Sorry, could not resist.
• SCSI : small computer system interface
• SDI service
• SFTGFOP : Special Finest Tippy Golden Flowery Orange Pekoe
• SICR : Sorry, I couldn't resist.
• SIDU : Sorry, I don't understand.
• SIMD : single instruction, multiple data
• SISDU : Sorry, I still don't understand.
• SITD : still in the dark
• SMD manipulator
• SMD repair station
• SNAFU : Situation normal, all fucked up!
• SO : significant other
• SOHF : sense of humour failure
• SOL : shit outta luck
• SOS
• SS, s.s. : steamship
• SSB receiver
• STA : scheduled time of arrival
• STD : scheduled time of departure
• STD : subscriber trunk dialing Br.
• STFU : Shut the fuck up!
• SUP : What's up?
• SW : short wave
• SW : software, shareware
• SW : southwest
• SWAG : super wild ass guess
• SWALK : sealed with a loving kiss
• SWAT unit
• SWIFT code
• SWL plate
• SWOT analysis
• SYL : see you later
• Saarbrücken
• Saarland
• Sabbath
• Sabine's Gull
• Sabine's Puffback
• Sabine's Spinetailed Swift
• Sabota Lark
• Sacramento
• Sacred Ibis
• Sacred Kingfisher
• Sad Flycatcher
• Saddle-bill Stork
• Saddleback
• Saddled seabream
• Saffron Finch
• Saffron Siskin
• Saffron Toucanet
• Saffron-billed Sparrow
• Saffron-breasted Redstart
• Saffron-cowled Blackbird
• Saffron-crested Tyrant
• Saffron-crowned Tanager
• Saffron-headed Parrot
• Sage Grouse
• Sage Sparrow
• Sage Thrasher
• Sagittarius
• Saigon
• Saint Bernard dog
• Saint George's
• Saint John's
• Saint Kitts and Nevis
• Saint Lucia
• Saint Peter
• Saint Vincent and the Grenadines
• Saint-Denis
• Sakalava Fody
• Saker Falcon
• Sakha
• Sakhalin
• Sale goods cannot be exchanged.
• Salle's Quail
• Salmon-crested Cockatoo
• Salomon Is Ground Pigeon
• Salt Lake City
• Salvador
• Salvadori's Antwren
• Salvadori's Duck
• Salvadori's Fig Parrot
• Salvadori's Nightjar
• Salvadori's Pheasant
• Salvadori's Weaver
• Salvin's Curassow
• Salvin's Negrito
• Salvin's Prion
• Salvins' Pigeon
• Salzburg
• Samar Tailor Bird
• Samara
• Samaritan