PYT
From Just Solve the File Format Problem
PYT is the format used by the Pythagoras CAD software, which features pointclouds, webservices, and other buzzwords. It apparently does something geospatial as well. There seems to be a mini-trend in CAD/CAM/3D programs to name them after ancient Greek geometers, as seen in Euclid, another Euclid, and Euklid. It may give you many cheerful facts about the square of the hypotenuse.
