I did some more research.

On my large toroid they used the same square crimp but it was labeled T&B
Which i think is this dragon tooth
Product line https://electrification.us.abb.com/products/connectivity-grounding/dragon-tooth-magnet-wire-termination-system

I see TE connectivity has something similar as well.
https://www.te.com/en/products/brands/amplivar.html?tab=pgp-story