What does Botão De Voltar 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 Botão De Voltar?

HTC first drew Botão De Voltar in Sense 7, released 30 de março de 2015.

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

HTC

HTC Corporation has drawn Botão De Voltar 2 times. Every revision HTC has shipped is below, newest first.

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

HTC artwork for this emoji spans 2015 to 2016.