It depends. I'm guessing you mean a circle with two circles at roughly 11 o'clock and 1 o'clock placement making a "mikey head". If so and you use it in a commercial fashion (advertising, store sign, etc.) not related to Disney, then yes you are infringing on a trademark. For a personal/private use, not to be seen by a mass audience, then it is probably ok altough it could still be an infringment technically. I had a class on this years ago and it is fuzzy. Hope this is of some help. As a disclaimer you should talk to an attorney if this answer is really important. I am not one!