• TIRKS Table System (Alcatel)
  • Table Top System
  • Tabletop Simulator (gaming)
  • Tactical Training Simulator (US DoD)
  • Tactical Training Strategy
  • Taipei Trade Shows (Taiwan)
  • Tank Thermal Sights
  • Tape Tracking System
  • Target Tug Squadron
  • Targeting-Tracking System (gaming)
  • Task Tracking System
  • Task Transfer Sheet
  • Teacher Training School
  • Technical Test Specification
  • Technical Training Specialist
  • Technical Training Squadron (USAF)
  • Technology Transfer Society
  • Teka Teki Silang (Indonesia crossword)
  • Telegraphic Transfer Selling (currency rate)
  • Telemetry Test Simulator
  • Teletypesetter
  • Temperature Test Set
  • Temporary Technical Services, Inc.
  • Temporary Threshold Shift (hearing)
  • Tenure Track System (various locations)
  • Tertiary Trauma Survey (medical examination)
  • Test Technology Symposium
  • Test and Training Satellite ULMS Undersea Long-Range Missile System (AGARD Multilingual Aeronautical Dictionary - Acronyms and Abbreviations)
  • Text To Speech
  • The Thespian Society (Philippine Normal University)
  • The Transit System (Texas)
  • The Transplantation Society (Canada)
  • Thermo Time Switch
  • Transaction Tracking System
  • Trunk Time Switch
  • Through the Stargate (gaming)
  • Through-The-Scope (esophageal balloon dilator)
  • Through-the-Sensor
  • Thru Tubing Solutions (Oklahoma City, OK)
  • Tilt Tray Sorter (baggage handling systems)
  • Timber Stringer- Timber Deck (engineering)
  • Time Temperature Superpositioning
  • Time to Service
  • Time to Sleep
  • Time to Stabilization
  • Time-Temperature-Sensitization
  • Timed Transition System
  • Toeristiek Travel Search (tourism; Netherlands and Belgium)
  • Torrance Transit System (California)
  • Total Technical Support (various companies)
  • Total Technology Solution (software)
  • Total Training Solutions
  • Total Travel Service, Inc.
  • Tracked Transit System
  • Training the Street, Inc (New York, NY financial instruction)
  • Transaction Tracking System
  • Transdermal Therapeutic System
  • Transistor-Transistor Logic, Schottky Barrier
  • Transition to Supervision
  • Transition to Support
  • Transmission Test Set
  • Transparent Touch Screen
  • Transportation Technical Services (est. 2003)
  • Travel Time System (various locations)
  • Travel to Scanplane (MRI scans)
  • Trinity Theological Seminary (various organizations)
  • Triple Transient Suppression
  • Trouble Ticketing System
  • Trouble Tracking System (Hekimian)
  • True Total Sulfur
  • True to Size (merchandise fitting)
  • Trunk Traffic Simulator
  • Tuesday, Thursday, Saturday (schedule)
  • Twin Transfusion Syndrome (medical)
  • temporary threshold shift (hearing) [TTS2 = temporary threshold shift measured 2 minutes after exposure]