What does Red Exclamation Mark 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 Red Exclamation Mark?

HTC first drew Red Exclamation Mark in Sense 7, released March 30, 2015.

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

HTC

HTC Corporation has drawn Red Exclamation Mark 2 times. Every revision HTC has shipped is below, newest first.

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

HTC artwork for this emoji spans 2015 to 2016.