Circular arrows pointing in a clockwise direction. Used in music player applications to loop a track or album continuously. Commonly used to repesent a retweet on Twitter.
Repeat Button was approved as part of Unicode 6.0 in 2010 under the name “Clockwise Rightwards and Leftwards Open Circle Arrows” and added to Emoji 1.0 in 2015.
U+1F501
? Clockwise rightwards and leftwards open circle arrows