TI
- ti – (s) Tigrinya language (ISO 639-1 code)
- Ti – (s) Tebi – Titanium
- TI – (s) Tajikistan (FIPS 10-4 country code) – (i) Thermal Imaging – Threat Identification – Training Instructor – Texas Instruments
- TIA – (i) Total Information Awareness initiative
- TIALD – (i) Thermal Imaging and Airborne Laser Designation
- TIAA-CREF – (i, pronounced as "T-I-A-A-cref") Teachers Insurance and Annuity Association – College Retirement Equities Fund
- TIBS – (a) Tactical Information Broadcast System
- TIC – (a) Troops In Contact
- TID – (p) Target Identification – (i) ter in die (Latin, "three times daily")
- TIGERS – (a) Topologically Integrated Geographic Encoding and Referencing System
- TIM – (a) Technical Information Memorandum – Technical Interchange Meeting – Toxic Industrial Material – Telecom Italia Mobile
- TIMS – (a) Tactical Internet Management System – The Institute of Management Sciences – The International Molinological Society – Thermal Infrared Multispectral Scanner – Thermal Ionization Mass Spectrometry – Travel Information Management Services – Tuberculosis Information Management System
- TINC – (a) There Is No Cabal
- TINY – That Is, Not You (internet slang)
- TIP – (a) Thermal Identification Panel
- tir – (s) Tigrinya language (ISO 639-2 code)
Read more about this topic: List Of Acronyms And Initialisms: T