TI

TI (or "Ti", "ti" or "T.I.") is an abbreviation that can mean:
* Titanium (as "Ti"), the chemical element of atomic number 22
* Taiwan independence, a political movement
* Texas Instruments, an American electronics company
* Toastmasters International, an international public speaking organization
* T.I. (born 1980), an American hip-hop artist
* Acronis True Image, at times referred to as TI - is a disk imaging program
* Thermal instability
* Thursday Island, an island in the Torres Strait
* Ticino, a canton (federated state) of Switzerland
* Tiger Inn, a Princeton University eating club
* Tol Air, IATA airline designator
* Tourist information
* Transparency International, an international organisation devoted to fighting corruption.
* Treasure Island Hotel and Casino (as "ti"), an American hotel and casino resort in Las Vegas, Nevada
* Thermal imaging
* The Times Independent, a local newspaper in Moab, Utah
* TI Group, a former British company that owned specialist engineering companies
* Time immemorial
* Twilight Imperium, a series of board games released by Fantasy Flight Games
* The Treason of Isengard, a book by Christopher Tolkien
* Ti, or pTi, the tumor-inducing plasmid harbored by some "Agrobacterium tumefaciens" strains or biovars
* Toxic injury, a chronic increase in sensitivity to common chemicals also known as multiple chemical sensitivity
* The ISO 639-1 code for the Tigrinya language

Ti (or "Tī", or "T'i") as a word can mean:
* "Ti" (see Solfege), a musical note on the diatonic scale
* Ti (plant), the plant "Cordyline fruticosa"
* Tī kouka, the New Zealand cabbage tree
* T'i, "substance" in Chinese
* Tyr (as "Ti" from Old Swedish), the deity of Norse mythology
* Ti, an abbreviation for the IEEE prefix tebi which represents 2⁴⁰
* "ti" Treasure Island Hotel and Casino in Las Vegas, Nevada.