Fun fact: Torx screwdrivers are compatible with Torx Plus screws, but Trox Plus screwdrivers are only compatible with Torx screws that are one size larger
Why does Torx Plus have six teeth but tamper-resistant Torx Plus has five? Whereas 'what the fuck is this' basically looks like it should be tamper-resistant Torx Plus?
I guess they wanted to make the screws even more tamper-resistant? With the standard Torx Tamper-Resistant screws, they could often be bypassed by chiseling the pin away with a flathead and a hammer, and then using a standard Torx driver. Can't do that with the pentalobular design!