Are you sure it is a circle?
There are some high-beam indicators that look kinda like what you are describing, and also some fog light indicators as well. It's more a very rounded triangle with lines "projecting" out from it, sometimes straight, sometimes angled, sometimes squiggly with a vertical line through them, sometimes to the left, sometimes to the right. That's just from some basic image searching on google.
A pic would definitely help, if you could link it here.