The function key, on iOS and possibly Mac keyboards, is bound1 to show the emoji picker.
Apple has chosen to bind a whole key, no modifiers or anything, to “convey an emotion”. A (cartoonish) picture is worth a thousand words.
🧠 Smart!
(I could go on for at least five minutes about Apple’s recent design advantage is in introducing big features without making them shout-y in the UI. Granted, the marketing is very shout-y.)
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By default, if I recall correctly. ↩︎