| Transportation and Climate Initiative | Academic & Science |
| Transistor Controled Ignition | Academic & Science |
| Transportation Climate Initiative | Academic & Science |
| Tenerife | Airport Code |
| Transaction Component Interface | Banking |
| Third Country Initiative | Business |
| Transcontinental Realty Investors, Inc. | Business |
| Truly Creative Ideas | Business |
| Trust Competitiveness And Integrity | Business |
| Technology Career Institute | Business |
| Theatrical Creations Inc | Business |
| Tele Communications Inc | Business |
| Turbine Controls Inc | Business |
| Trading Cards Inc | Business |
| Techtrol Cyclonetics Inc | Business |
| Technology Consulting Inc | Business |
| Twizted Comix Inc | Business |
| Trust, Commitment, Innovation | Business |
| Total Customer Interactions | Business |
| Total Capital Investment | Business |
| Transport Corporation of India | Business |
| Trade Credit Insurance | Business |
| Tsukuba Center Inc | Business |
| To Come In | Community |
| Tamastslikt Cultural Institute | Community |
| Trinity Church International | Community |
| Third Culture Individual | Community |
| Touring Club Italiano | Community |
| Trauma Care International | Community |
| Telecommunication Company of Iran | Community |
| Technology Collaboration Innovation | Computing |
| Trustworthy Computer Initiative | Computing |
| Transceiver Control Interface | Computing |
| Test Cell Input | Computing |
| Trusted Cloud Initiative | Computing |
| Technology College Initiative | Educational Institute |
| Titlecode Common Information | General |
| Troop Carrier Infantry | General |
| Tropical Cyclone Intensity | General |
| The Challenge Initiative | General |
| To Come In (Personally) | General |
| Trane Communications Interface | General |
| Tuned Capacitance Inductance | General |
| Tree Care Industry | General |
| Telephone Collectors International | General |
| Total Cost Involved | General |
| Turks Caicos Islands | General |
| Tuned Capacitance and Inductance | General |
| True Client Involvement | General |
| Tungsten Carbide Insert | General |
| Turbo Charged Intercooler | General |
| Turbo Charged Compression Ignition | General |
| Temperament and Character Inventory | General |
| Toyota Club Italia | General |
| Tactical Command Industries | General |
| Topolino Club Innerschweiz | General |
| Tire Centers Inc. | General |
| Terios Club Italia | General |
| Theme Centered Interaction | General |
| Terrano Club Indonesia | General |
| Transport Cost Index | General |
| Trade Competitive Index | General |
| Toyota Corona Indonesia | General |
| tal Channel Interference | General |
| Track Condition Index | General |
| Toyo Tire Canada Inc. | General |
| Total Cost Indicators | General |
| Try Calling In | General |
| Trash Can Industries | General |
| Texas Correctional Industries | General |
| Transportation Consultants Inc | Governmental |
| Tata Cornell Institute | Governmental |
| The Commonwealth Institute | Governmental |
| Tennessee Corrections Institute | Governmental |
| Teachers Curriculum Institute | Governmental |
| Transportation Capital Improvements | Governmental |
| Transistor Controlled Ignition | Governmental |
| Taycheedah Correctional Institution | Governmental |
| TCI the Commonwealth Institute | Governmental |
| Técnicos y Consultores de Inversiones | International |
| T?nicos y Consultores de Inversiones | International |
| Talent Consultants International | International |
| Transient Cerebral Ischemia | Medical |
| Tisch Cancer Institute | Medical |
| Therapeutic Crisis Intervention | Medical |
| Thermal Comfort Inventory | Medical |
| to come in (for appt.) | Medical |
| Target-Controlled Infusion | Medical |
| Total Cerebral Ischaemia | Medical |
| Transient Cerebral Ischaemia | Medical |
| Transient Cognitive Impairment | Medical |
| Tag Control Information | Networking |
| Transport Corporation of India Limited | NSE Company Symbol |
| Tenerife, Canary Islands | Regional |
| Tam?tslikt Cultural Institute | Regional |
| Toyota Canada Inc | Regional |
| Tamástslikt Cultural Institute | Regional |
| Test Configuration Infrastructure | Softwares |
| Technical Critical Item | Space Science |