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

[famous bob]

It was to deter stealing this fuel door. The thief didn't have access to the inside end of the screw but owner probably has a key.
AMC Gremlin had a big fancy expensive fuel cap without any theft deterrent. I lost 1 off the 71 model and 1 off the 73 model. Dealer got about 14 dollars for it.

View attachment 1715701466

My barracuda didnt have that fuel door , but did come from the factory w/ the flip top that had urinal theft proof screws in it , doesnt now tho.

 

[gzig5]

If you don't need the screws, you can make a tool out of an extra socket to remove and install them. Mark the positions with a marker and use a cutoff wheel to create three prongs on the end of an appropriately sized socket.

 

[Mopar Vince]

If you don't need the screws, you can make a tool out of an extra socket to remove and install them. Mark the positions with a marker and use a cutoff wheel to create three prongs on the end of an appropriately sized socket.

Now THIS is why I love this forum.
Thanks