Syntaxis

A syntaxis is an abrupt major change in the dominant orientation of the main fold and thrust structures in an orogenic belt. For example, the Himalayan belt forms a continuous gentle curve in its main part, running almost perpendicular to the motion of the Indian Plate as it collides with the Eurasian Plate. This thrust-dominated plate boundary connects at both ends to the highly oblique, strike-slip dominated boundaries running through Pakistan and Myanmar, forming the Nangar Parbat syntaxis to the west and the Namche Barwa syntaxis in the east. 

This article uses material from the Wikipedia article  Metasyntactic variable, which is released under the  Creative Commons Attribution-ShareAlike 3.0 Unported License.