stereotypy
Excessive repetition, especially of meaningless gestures.
countable
Coordinate term: stimming
The process of making stereotype plates and printing from them.
uncountable
Where it comes from
Borrowed from French stéréotypie, from stéréotype + -ie. By surface analysis, stereotype + -y (suffix forming abstract nouns).
Adapted from the Wiktionary entry stereotypy (CC BY-SA 4.0).