TI

• Ti/Si, the seventh syllable in the solfège technique
• The International (Dota 2), an esports tournament
• Twilight Imperium, a game

• TI-class supertankers, ships operated by Tankers International
• Texas Instruments, an American electronics company
• Telecom Italia, an Italian telecommunications company
• TI Group, previously Tube Investments, an English engineering company
• Therapeutics Initiative, a medication evaluation organization
• Tiger Inn, a Princeton University eating club
• Toastmasters International, a public speaking organization
• Former Tol Air, IATA code
• Tailwind Airlines, IATA code
• Transparency International, anti-corruption organisation
• Treasure Island Hotel and Casino, Las Vegas, US

• Ti, a high-status official during the Fifth Dynasty of Egypt
• Ti. for Tiberius, a Roman given name
• T.I. (born 1980), American rapper
• TI, post-nominal initials used by awardees of Tamgha-e-Imtiaz, a Pakistani honour
• "Targeted individual", person claiming to be subject to "gang stalking"
• Ti, Bonnie Nettles, religious leader

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

• Ti or Tī, a generic name in Polynesian languages for plants of the genus Cordyline, including:
• Cordyline fruticosa, Tī, Tī pore (Māori), Kī (Hawaiian)
• 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

• Ti (prefix symbol), of interim unit tebi; e.g. Tib for tebibit

• Topological insulator
• Titanium, symbol Ti, a chemical element
• Truncated icosahedron

• 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")
• ti (digraph), the characters {{angbr|ti}}
• Tenant inducement, in commercial real estate

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• Di (disambiguation) for several Chinese concepts; "Ti" is the Wade–Giles equivalent of "Di"
• TL (disambiguation)
• T1 (disambiguation)
• {{lookfrom|TI}}
• {{lookfrom|ti}}
• {{intitle|Ti}}
• {{intitle|T.I.}}

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