Little light on Nokia E90's front

[HELLAS]

What is the little light (looks like a LED) to the right of the screen on the Nokia E90. I have never seen it blinking or shining. Any reason?

 

[xrapidx]

Light sensor for the keypad.

If the room is light - and the phone is on, hold your finger over it, you'll see the keypad lights up.

 

[Peder]

light sensor...