What does リピートボタン look like on HTC?

On HTC it is the design shipped in Sense 8, shown above at full size. Older revisions are listed beneath it.

When did HTC add リピートボタン?

HTC first drew リピートボタン in Sense 7, released 2015年3月30日.

HTC Corporation has shipped 2 versions of リピートボタン. Each is dated, so you can see when the design changed.

HTC

HTC Corporation has drawn リピートボタン 2 times. Every revision HTC has shipped is below, newest first.

What does リピートボタン look like on HTC?: On HTC it is the design shipped in Sense 8, shown above at full size. Older revisions are listed beneath it.
When did HTC add リピートボタン?: HTC first drew リピートボタン in Sense 7, released 2015年3月30日.
How many times has HTC redrawn リピートボタン?: HTC Corporation has shipped 2 versions of リピートボタン. Each is dated, so you can see when the design changed.

HTC artwork for this emoji spans 2015 to 2016.