What does Double Curly Loop 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 Double Curly Loop?

HTC first drew Double Curly Loop in Sense 7, released March 30, 2015.

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

HTC

HTC Corporation has drawn Double Curly Loop 2 times. Every revision HTC has shipped is below, newest first.

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

HTC artwork for this emoji spans 2015 to 2016.