Wiggler (noun)

1. A person or thing that wiggles.
2. A tool used for measuring small movements or vibrations in machinery.

Origin:

From the verb wiggle.

Examples:

1. The child was a wiggler and couldn't sit still during the movie.
2. The wiggler was used to measure the vibrations in the machine.
3. The wiggler was used to find the source of the noise in the car engine.
4. The worm is a type of fishing lure called a wiggler.
5. The wiggler was used to check the alignment of the machine.