Meaning
The number five on a square keycap. It means five or fifth, sitting right in the middle of the digit keycaps.
It is handy for ratings and reviews, short timers and anything counted on one hand: “Service 5️⃣ out of 5️⃣, will be back” It pairs with ✋ for a high five or ⭐ for a five-star review. Sent on its own, it often asks for five more minutes.