Enjoyed the Engineer’s dictionary!

A couple more spring to mind:
Allen keys - A tool for keeping you fit walking back and forth between the tool storage draw and the job until you get the right size. Can also be used to undo Allen head bolts.

Lathe Chuck keys - Used for testing the impact resilience of the wall or anything else in between the freshly started chuck and the flight path.

Thread taps - Useful for filling in holes in materials and making them whole again. Works especially well on jobs with many hours invested on one of the last operations.