Symbols on some of the Function Keys on the Top Row

[Icebun]

What do the symbols represent on the F3 and F4 keys?

Originally I thought they were to control the volume (but nothing happens) in addition to the HW buttons on the top.

Does anyone know what they do?

 

[hughlle]

F3 is mute and F4 is play/pause. edit sorry, I was looking at my SP3 keyboard. They are for increasing or decreasing the keyboard backlight.

 

[GreyFox7]

Surface 3 keyboard layout is different than others.
Key icon --- What it does
F3

Decreases keyboard backlighting
F4

Increases keyboard backlighting