What does Repeat Single 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 Repeat Single Button?

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

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

HTC Sense 8

This is the design HTC introduced in Sense 7, shipped again unchanged. It was not redrawn for this release.

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

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