What sort of interesting actuators are used that people might not commonly think of? (I'm thinking of interesting solutions like the JWST's mirror actuators [0]

What sort of interesting actuators are used that people might not commonly think of? (I'm thinking of interesting solutions like the JWST's mirror actuators [0].) 0. https://hackaday.com/2022/02/08/working-model-reveals-amazing-engineering-of-webbs-mirror-actuators/ https://hackaday.com/2022/02/08/working-model-reveals-amazin...