What is rectangular app next to the "ping iPhone" app in the iwatch?

[sunsetst]

There is a rectangular app with a triangle at the bottom , it's not highlighted so tapping it won't turn it on.

 

[Ledsteplin]

More info? Is it blue with a while triangle? If so, that's the remote for the TV. If not, what color is It?

 

[Just_Me_D]

What is rectangular app next to the "ping iPhone" app in the iwatch?

There is a rectangular app with a triangle at the bottom , it's not highlighted so tapping it won't turn it on.

It's the AirPlay option.