Stigma (letter) Stigma (letter) Stigma (ϛ) is a ligature of the Greek letters sigma (Σ) and tau (Τ), which was used in writing Greek between the Middle Ages and the 19th century. It is also used as a numeral symbol for the number 6. In this unrelated function, it is a continuation of the old letter digamma (originally Ϝ, cursive form ), which had served as a numeral since antiquity and was conflated with the σ-τ ligature in the minuscule handwriting of the Middle Ages. The στ ligature (, ) was one of many ligature forms that came into widespread use as
Torque (game engine) successor to Torque Game Engine Advanced (TGEA), Torque 3D features PhysX support, modern shader features, an advanced deferred lighting model, as well as build support for Windows, macOS and Linux. DTS and DIF have been superseded by COLLADA, a more commonly supported interactive 3D model file format. The DIF format has been completely deprecated, while DTS is still used as an internal format. Torque 2D, originally Torque Game Builder, is a game engine designed for 2D games and based on the "Torque Game Engine". It was first released in 2006, in a "standard" and a "pro" version, with the professional