I personally think that "Action" itself represents all other actions. Since it's so vague, there can't be a representation.
But this is needed, to be used in a tooling application UI. Please help with a design or a suggestion.
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first, can you describe what this icon does in a sentence?
can you describe what will happen when you click it?
can you give additional meanings to this Icon?
sometimes it's easier to define a word in an icon by explaining it to yourself(that's also true for copywriting).
As you said it's vague and can have many meanings, so try to find your aim.
Also, you can search icon sites like https://www.iconfinder.com/, search for action, and find other descriptive wards for similar icons, this technic might get you closer to your goal.