Meaning
The number seven on a square keycap. It means seven or seventh, and it matches the number of days in a week.
It fits weekly plans, seven-day streaks and challenges, and in many Western traditions seven is a lucky number, so it shows up in good-luck wishes: “Studied 7️⃣ days straight, I deserve this bubble tea” In Vietnamese, seven is sometimes read as “thất”, meaning loss, so some business owners avoid it.