Hierarchical state charts have been formalized as a type of UML diagram. Details:
https://en.wikipedia.org/wiki/UML_state_machine
I think it's either "hierarchical state machines" or just "statecharts", otherwise it's a bit like saying ATM machine or CC card.
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I think it's either "hierarchical state machines" or just "statecharts", otherwise it's a bit like saying ATM machine or CC card.