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There are no IPA keys for whistling.

Sure there are: [s͎˩˧˥˧˨˦˥˧˥˧˨˦] and so on. But really I see no reason why musical notation wouldn’t be sufficient.

(I should note that’s not [s]; it’s [s͎] with an arrow below it. It’s hard to tell the difference with the font on my screen.)

That's interesting thanks! There's not much on wikipedia [0] about that character, but it does appear to be for whistled speech!

You’re welcome! I first saw it on the Wikipedia page for Shona, which has several whistled consonants within its inventory.