What does Doppelschleife 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 Doppelschleife?

HTC first drew Doppelschleife in Sense 7, released 30. März 2015.

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

HTC

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

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

HTC artwork for this emoji spans 2015 to 2016.