OT is an abbreviation for:

  • Aeropelican Air Services Pty Ltd, an Australian feeder airline, based in Newcastle, New South Wales after the IATA code
  • Qatar to the ICAO code
  • At top dead center of a piston engine
  • Open Door ( Youth Services ), a working concept of child and youth care
  • Often used without titles for works of art
  • Old Tablers, the senior citizens' organization of roundtable
  • Operating Thetan, see Operating Thetan, the state of spiritual purity in the world view of the Scientology organization
  • Optimality Theory (English optimality theory ), a linguistic theory
  • Optical technologies Photonics see
  • Ordo Teutonicus as additional name for members of the Teutonic Order
  • Organisation Todt, a mass organization of the NSDAP
  • Orientation diving, a sport
  • Original title, a label for ( foreign-language ) book and movie titles
  • Overtime, (English for " extension " ), in a variety of sports games


  • District

Computer science:

  • Off-topic, a concept of network jargons
  • Without text, a concept of network jargons, see list of abbreviations (network jargon )
  • Open theory, a free project for theory development in the Internet
  • OpenType, a computer technology for fonts

OT as a distinguishing mark on license plate:

  • Italy: Province of Olbia- Tempio Sardinia
  • Netherlands: semi-trailer
  • Romania Olt County
  • Czech Republic: Ostrava -město, German: Ostrava City ( discontinued)
  • Hungary: Oldtimer


  • Obermain Tageblatt, a regional daily newspaper in Upper Franconia
  • Offenburger Tageblatt, a regional daily newspaper in Offenburg, Baden- Württemberg


  • Occupational therapy, see ( occupational therapy)
  • Orthopedic technology, see orthopedic technician
  • Oxytocin, a peptide hormone from the hypothalamus


Ot stands for:

  • Ѡ, a letter of the Old Church Slavonic alphabet
  • Ot (Mountain), Piz Ot, a mountain in the canton of Grisons, Switzerland

See also:

  • Disambiguation
  • Abbreviation