It is one of the mounts offered with Panavision cameras and Panavision-designed lenses.
Panavision also modifies ("Panavises") its third party camera and lens equipment in the interest of allowing clients to retain their personal preferences regarding equipment.
The mount itself contains four pronged flanges, one of which contains a locating pin in the center.
This pin is normally seated at the bottom of the camera lens mount, the usual location where a complementary hole exists.
This has become a crucial factor in recent years, as bigger lenses with zoom capabilities, longer focal lengths, or larger lens elements have raised the bar on requirements for mount stability.