Endianness within bytes (or words) is actually a thing - IBM long numbered bits from the most significant starting with 0 (think of 360s and the like, not PCs)

Endianness within bytes (or words) is actually a thing - IBM long numbered bits from the most significant starting with 0 (think of 360s and the like, not PCs) - there are modern chips with registers numbered the same way (a current family of multi-core ARM chips I'm currently working with number their GPIOs this way too)