BRL-CAD geometry
From Just Solve the File Format Problem
A BRL-CAD geometry is a file defining the shape of a solid model as created and used in the BRL-CAD (Ballistic Research Laboratory CAD Package) software. This software originated at the Advanced Computing Systems Group of the U.S. Army Ballistic Research Laboratory, but is now an open-source project. The normal format is binary, but it can also be saved in a text-based format called ASC (which has two different versions, old and new).
