Name of Placement "Puck" Used for Robot Teach

Hey all, I'm in the process of re-teaching a wafer handling robot arm for a tool - I'm trying to source a part but can't remember the name for what it is and am struggling to find examples. The part I'm talking about is a "puck" looking object that fits into the wafer aligner and can be attached to the robot arm. The idea is that when the arm is fitted into the puck, you can then teach that position and it eliminates trial & error. Does anyone recall the technical name of this part? I know the explanation is a bit vague but this is my hail mary. Thanks