Faceplate

The metal sheet that surrounds the bolt and is mounted to the door edge. There are four types.

Universal:  Latches that utilize interchangeable faceplates are referred to as universal or 6-way latches. Universal latches include a drive-in latch and both square and radius faceplates that can be attached to the latch to simulate a fixed faceplate latch. The 6-way latch designation comes from the 6 different door requirement combinations that the universal latch will accommodate (i.e. 3 door configurations x two backset options each = 6 ways to utilize).

Square:  Square corners