Looking for alternate name for robotic arm end effector

There is another name for a robotic arm end effector that was created by a science fiction writer in the mid to late 20th century. I cannot think of it for the life of me. Any help would be greatly appreciated.

Don’t know anything specific from a Si-Fi writer, so just throwing words out there: gripper / pincer / clamp…
Any ideas what it did? Any additional clues might help.

Hey, I found the answer. The word I was looking for was “Waldo”. Thanks