Some type of security screw is there.
It's not really meant to be opened.
https://wolfliving.tumblr.com/post/183450493991
It's not really meant to be opened.
https://wolfliving.tumblr.com/post/183450493991
It probably doesn't have a name. It's just some special screw that the manufacturer has chosen to prevent you from tampering with the inside of whatever it is.
what I find is some type of "Spanner Slotted Tamper Proof"
Tri-Groove, https://www.extreme-bolt.com/tamper-resistant-security-screws.html
https://www.amazon.com/Tri-Groove-Tamper-Security-Driver-Sockets/dp/B071YVWMX4
https://www.zoro.com/eazypower-triple-groove-scrty-screw-sttr-sizes-1-4-35933b/i/G1116199/
https://www.bcsiteservice.com/product/anti-theft-tri-groove-security-bolts/
Tri-Groove, https://www.extreme-bolt.com/tamper-resistant-security-screws.html
https://www.amazon.com/Tri-Groove-Tamper-Security-Driver-Sockets/dp/B071YVWMX4
https://www.zoro.com/eazypower-triple-groove-scrty-screw-sttr-sizes-1-4-35933b/i/G1116199/
https://www.bcsiteservice.com/product/anti-theft-tri-groove-security-bolts/
Looks more like a riveted extension cord than an outlet. I haven't seen an outlet that's not meant to be opened and have cables connected to it. If it's as I suspect on an extension cord, it probably won't help to successfully open it since there are probably riveted connections inside there as well.