TI, ti, and variants may refer to:

Arts and entertainment

* Ti/Si, the seventh syllable in the solfège technique * The International (Dota 2), The International (''Dota 2''), an annual esports tournament for the video game, ''Dota 2'' * ''Twilight Imperium'', a game

Businesses and organizations

*TI-class supertankers, ultra-large tanker ships operated by Tankers International * Texas Instruments, an American electronics company * TI Group, previously Tube Investments, an English engineering company * Therapeutics Initiative, an evidence based medication evaluation organization * Tiger Inn, a Princeton University eating club * Toastmasters International, an international public speaking organization * Tol Air (IATA airline designator TI) * Tailwind Airlines, IATA code * Transparency International, an international organisation devoted to fighting corruption * Treasure Island Hotel and Casino, an American hotel and casino resort on the Las Vegas Strip

People

* Ti, a high-status official during the Fifth Dynasty of Egypt * Ti. for Tiberius (praenomen), Tiberius, a Roman given name shared by several people * T.I. (born 1980), American rapper and actor; real name Clifford Harris * Stephen Michael, Australian rules footballer * TI or targeted individual, self-name for the category of delusional people who claim to be targets of electronic harassment * Ti, Bonnie Nettles, religious leader

Places

* Ti, Oklahoma, US * Thursday Island, Torres Strait * Ticino, a canton (federated state) of Switzerland

Science, technology, and mathematics

Biology and medicine

* Cabbage tree (New Zealand), called "tī kouka" * Terminal ileum, the last part of the small intestine * Ti or Tī, a generic name in Polynesian languages for plants of the genus ''Cordyline'', including: ** ''Cordyline fruticosa'', Tī, Tī pore (Māori), Kī (Hawaiian), a widely cultivated plant throughout Polynesia ** ''Cabbage tree (New Zealand), Cordyline australis'' (Tī kōuka or Cabbage tree, New Zealand) ** ''Cordyline banksii'' (Tī ngahere or Forest cabbage tree, New Zealand) ** ''Cordyline indivisa'' (Tī toī, tōī or Mountain cabbage tree, New Zealand) ** ''Cordyline obtecta'' (Tī, Norfolk Island cabbage tree, Three Kings cabbage tree, Norfolk Island and New Zealand) ** ''Cordyline pumilio'' (Tī rauriki, Tī koraha or Dwarf cabbage tree, New Zealand) * Therapeutic index * Tricuspid insufficiency, a leakage of blood within the heart

Computing

* Ti (prefix symbol), the prefix symbol of the binary unit prefix tebi * Technical informatics, a subclass of computer engineering * Acronis True Image, a disk imaging program

Other uses in science, technology, and mathematics

* Topological insulator * Thermal instability * Thermodynamic integration * Titanium, symbol Ti, a chemical element * Truncated icosahedron

Other uses

* Ti (concept), a term meaning "substance" (體) in Chinese * TI (cuneiform), a sign in cuneiform writing * Ti, Old Swedish spelling of Týr, deity of Norse mythology * Tigrinya language (ISO 639-1 code "ti") * Tenant inducement, in commercial real estate