These are Mini Cooper car badges for grills and license plates. They commonly are found on cars in motoring clubs. It is like a bumper sticker, but round and less permanent.

This is not just a Mini thing, but also used on Jeeps, BMW and Land Rover clubs.

These badges were designed to work with the badge holder designed by PunkGeek, but will work with most 3" badge holders.
https://www.thingiverse.com/thing:3245549

I was inspired by PunkGeek's OctoCat badges:
https://www.thingiverse.com/thing:3272065

There are three designs included

• A blank template
• A Skull and Crossbones
• A Hello-My-Name-Is sticker - This is designed to be edited to include the name of your car.

These badges, like PunkGeek's, are designed to be paused during the print to change the filament color, allowing the end result to be multi-colored.

Happy Motoring!