What type of nut is this?

Franglais:

the nodding donkey:
Most sets of multi fastner bits have a selection of torx, both the standard and non tamper version. Can be had in Wilko, halfrauds, or anywhere else that sells tools.

True.
Anti-tamper fittings . . . AKA “we want some more cash so here is yet another type of fitting that you`ve gotta get tools for”.

Oh you old cynic… :grimacing: