Wikipedia
Tribhaṅga or Tribunga is a (tri-bent pose) standing body position or stance used in the traditional Indian sculpture, art and Indian classical dance forms like the Odissi. As compared with the contrapposto pose Tribhanga, literally meaning three parts break, consists of three bends in the body; at the neck, waist and knee, hence the body is oppositely curved at waist and neck which gives it a gentle "S" shape and is considered the most graceful and sensual of the Odissi positions. It has been closely associated with the Hindu deity Krishna who is often portrayed in this posture.
The Indian classical dance of Odissi is characterized by various Bhangas or stance, which involves stamping of the foot and striking various postures as seen in Indian sculptures, they are four in number, namely Bhanga, Abanga, Atibhanga and Tribhanga being the most common of all. The Sanskrit term Tribhanga means Three Bhanga and according to K. M. Varma the term Tribhanga is not the name of a particular standing position but is used in the Silpasastra literature to describe the group of the “Three Bhangas”, namely Abhanga, Samabhanga, and Atibhanga.