What does زر ترجيع 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 زر ترجيع?

HTC first drew زر ترجيع in Sense 7, released 30 مارس 2015.

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

HTC

HTC Corporation has drawn زر ترجيع 2 times. Every revision HTC has shipped is below, newest first.

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

HTC artwork for this emoji spans 2015 to 2016.