Rewind, Double Arrow, Return
This is a rewind button composed of two overlapping triangles to the left. It should be noted that on different platforms, the color of the background image depicted is different. For example, on the Google platform, the background color is orange; while on the Apple platform, the background color is gray-blue. This "rewind button" is usually common in early video tapes. Therefore, the emoji can not only be used to specifically refer to when you missed some plot or want to watch it again, you can rewind the video to the part not long ago, but also can express your regret about something.
