The number three is used in education (“I'm counting to three!”) or is a stimulus for another attempt (“All good things come in threes”). We often count down from three to ring in a start.
Learn more about the meaning
Emoji History
Development of the emoji in the Unicode lexicon
First included
The emoji “Keycap: 3” was approved as part of Unicode 6.0 in 2010 and added to Emoji 0.6.