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In Clojure (and I’m pretty sure Scheme), ! and ? are not sigils in the sense that they’re special syntax like, say, @ (which is a reader macro), or @ and @@ in Ruby: they just tend to be used by convention. ! and ? are no different than a or b.

You can read more about the Clojure reader here: https://clojure.org/reference/reader

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They somewhat follow the OP's definition of sigil (in the yellow box), which doesn't say that sigils have to be interpreted in a special way, only that they convey some meaning to the programmer (although it's a bit unclear - communicate to whom, programmer or interpreter?). They are also not at the beginning of the word, but that seems to be rather arbitrary requirement.

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