What does زر مربع أبيض 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 مربع أبيض?

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

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

HTC

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

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

HTC artwork for this emoji spans 2015 to 2016.