The function key, on iOS and possibly Mac keyboards, is bound1 to show the emoji picker.

Tap fn for emotions

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.)

  1. By default, if I recall correctly. ↩︎