9️⃣ Keycap Digit Nine

The Keycap Digit Nine emoji is a sequence of the 9 Digit Nine and ⃣ Combining Enclosing Keycap emojis. These display as a single emoji on supported platforms.

Keycap Digit Nine was approved as part of Unicode 3.0 in 1999 and added to Emoji 3.0 in 2016.