I first came across the Torx Plus rebuilding transmissions and transfer cases. Like a lot of systems, at least it is still a standardized system even if it means buying more tools off the tool truck. What threw me was the "triple square" socket head cap screws on German cars, which of course wasn't the same corner angles as the "double hex" from Japanese cars, and Honda of course had to use 10-point bolts in some of their applications too, lol!
Suddenly makes the Whitworth and BA tools I had to invest in for the shaper seem not so odd in the end, lol