Looks like a plastic rivet -- similar to the rivets Ford uses to affix the front license-plate bracket to the front bumper.
If that's what I think it is and you want to remove it, use an 1/8" drill bit to drill-out the center stem. Then you can pull out the larger button with the remaining part of the rivet.
You'll need new rivets if you want to put stuff back where you found it.