What does Reverse Button 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 Reverse Button?

HTC first drew Reverse Button in Sense 7, released March 30, 2015.

HTC Corporation has shipped 2 versions of Reverse Button. Each is dated, so you can see when the design changed.

HTC Sense 7

HTC shipped a new design for Reverse Button in Sense 7, released March 30, 2015. The previous design is shown beside it.

The first HTC release we hold for this emoji.

✳ marks a release that redrew this emoji. The rest re-shipped the design unchanged.

What does Reverse Button 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 Reverse Button?: HTC first drew Reverse Button in Sense 7, released March 30, 2015.
How many times has HTC redrawn Reverse Button?: HTC Corporation has shipped 2 versions of Reverse Button. Each is dated, so you can see when the design changed.