GT2

Gt2 is an acronym used in different contexts, most notably in entertainment and mathematics.

Gran Turismo 2 (GT2) refers to a 1999 racing simulation video game for the Sony PlayStation. Developed by Polyphony Digital and published by Sony Computer Entertainment, GT2 expands on the original Gran Turismo with a larger roster of licensed cars, more tracks, and expanded career options. Players progress through a series of license tests, championships, and time trials across arcade and simulation modes. The game is recognized for advancing the realism and scope of racing sims on the PlayStation era, and it helped establish Gran Turismo as a major franchise in console gaming. GT2 was followed by Gran Turismo 3: A-Spec on the PlayStation 2.

In mathematics, GT2 refers to a variant of the Grothendieck-Teichmüller group, a concept in number theory and algebraic geometry associated with Drinfeld. The Grothendieck-Teichmüller theory studies symmetries of profinite braid groups and connections to Galois representations, associators, and related structures in arithmetic geometry and quantum algebra. GT2 (along with related constructions such as GT1) occupies a specialized role within this area of study, where researchers investigate its defining relations, its relation to the absolute Galois group of the rationals, and its implications for the understanding of braids, manifolds, and multiple zeta values.

Overall, GT2 serves as an example of how the same acronym can denote a widely popular video game and a distinct, abstract concept in advanced mathematics.