| Travel Technology Initiative | Academic & Science |
| Tetiaroa Is | Airport Code |
| Tetra Technologies, Inc., of Delaware | Business |
| Technology Transfer Institute | Business |
| Tube Technologies, Inc. | Business |
| Touch Technologies, Inc. | Business |
| Traffic Technologies Ltd | Business |
| Tetra Technologies Inc | Business |
| Traffic Technologies Inc | Business |
| Tactical Technologies Inc | Business |
| Tampa Tank Inc | Business |
| Texas Torah Institute | Community |
| Teacher Training International | Community |
| Time Travel Institute | Community |
| Troupe Tag Inn | Community |
| Travel Time Index | Community |
| Travel and Tourism Industry | Community |
| Transmitter Terminal Identification | Computing |
| Two Task Interface | Computing |
| Terminal Transmission Identification | Computing |
| Time and Temperature Indicator | Electronics |
| Time Temperature Integrator | General |
| Transmit Terminal Identifier | General |
| Thurlby Thandar Instruments | General |
| Transmission Time Interval | General |
| Target Training International | General |
| TxA M Trans Inst | General |
| Tolerate Time Inversions | General |
| Tilted Transverse Isotropy | General |
| Type Traits Introspection | General |
| Tension time Index | General |
| Testing and Training International | General |
| Transmission Time In | General |
| Training and Treatment Innovations | General |
| Target to Improve | General |
| Time Temperature Indicator | General |
| Tom Tom International | General |
| True Touchpad Interface | General |
| Truck Tonnage Index | General |
| Toyota Team Indonesia | General |
| Time To Interactive | General |
| Top Tier Income | General |
| The Time to Interactive | General |
| Tips Tricks and Information | General |
| Temperature Threshold Interval | General |
| Truck Tech Industries | General |
| Tenure Team Initiative | General |
| Token Taxonomy Initiative | General |
| Think Tank Initiative | General |
| Taran Tactical Innovations | General |
| Track To Intercept | General |
| Terminal Translation Initilization | General |
| Time and Temperature Indicators | General |
| Thoracic Trauma Index | General |
| Trailing Torsional Arm Independent | General |
| Twin Turbo Intercooler | General |
| Traffic Technical Institute | General |
| Texas Transportation Institute | Governmental |
| Traffic And Travel Information | Governmental |
| Technology Transfer Indicator | Governmental |
| Toyota Technological Institute | Governmental |
| The Terrorist Institution | Governmental |
| Tukiendorf Training Institute | Governmental |
| TURTIPAR | Indian Railway Station |
| Trail Trace Identifier | Internet |
| Tool Tar Insane | Internet |
| Transfusion-Transmissible Infection(s) | Medical |
| Torpedo Tube Indicator | Military and Defence |
| Time and Time Interval | Military and Defence |
| Time To Intercept | Military and Defence |
| Takoradi Technical Institute | Regional |
| Transfer Trajectory Insertion | Space Science |
