What are these screw heads called? What tool is used?

Upon trying to remove the gas cap on our 68 Barracuda, we noticed these odd looking sheet metal screw heads.
I imagine it was a theft deterrent but I have never seen these.
What are they called and what is the tool to remove them?
Drill baby, drill?
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THEFT PROOF , MINE HAD THE ORIG. ONES LIKE URINAL STALLS USUALLY HAVE ,-----WHY , i DONT KNOW !