What is "tsd"

TSD may refer to:

• Tang Soo Do (tangsudo), a martial art
• Target-to-skin distance, a measurement in external beam radiotherapy
• Tay–Sachs disease, a genetic disorder, fatal in its most common variant
• Technical Services Division, another term for the CIA's Technical Services Staff
• Temperature-dependent sex determination
• Texas School for the Deaf
• Text, Speech and Dialogue, an international conference
• Thermionic specific detector, another term for nitrogen–phosphorus detector
• Time-speed-distance rally, another term for regularity rally in motorsport
• Total sleep deprivation
• Transylvanian Society of Dracula
• Treasury Solicitor's Department
• TSD (band), a 1990s girl band
• Turtle saving device, another term for turtle excluder device
• University of Wales Trinity Saint David, a university

TSD are a pop group who had a UK #69 hit with Heart & Soul, which also peaked at #258 in Australia, and a UK #64 hit with Baby I Love You. One of its members, Claire Richards, became a member of Steps, whose debut single - 5, 6, 7, 8 - charted fifty places higher at #14 in the UK.

The name "TSD" means very little; it was formed by taking three random letters out of a Scrabble bag. However, Newsround presenter Chris Rogers suggested it should stand for "Three Sexy Dames".