Sorry about the stupid question but...

[Chone]

What is that thing you see on every cartoon doctor's forehead.

You see? Like that I don't think I've ever seen it on a real doctor

 

[DoFoT9]

i thought it was a reflector for light, to reflect the ligh tonto the spot where the doc was looking??

 

[adrianblaine]

It's called a "head mirror". Although it may have other names as well.

http://cancerweb.ncl.ac.uk/cgi-bin/omd?head+mirror

 

[DoFoT9]

yay i was somewhat right!