Arrows pointing in a clockwise direction, with a number 1 badge in the lower corner. Used in music player applications to loop a track or album once.
Repeat Single Button was approved as part of Unicode 6.0 in 2010 under the name “Clockwise Rightwards and Leftwards Open Circle Arrows with Circled One Overlay” and added to Emoji 1.0 in 2015.
U+1F502
? Clockwise rightwards and leftwards open circle arrows with circled one overlay