In formal documents such as the NEC, it's referred to as the "grounded"
or "identified" conductor. However, everybody (including electricians)
call it a neutral most of the time.

I know, it's not really a neutral, but most electricians call it one
anyways. (It's why I referenced Mike Holt and the IEEE definition). By
definition, a neutral only carries unbalanced loads, hence the white wire in
a 120 v circuit (which carries full loads) is defined as an identified
conductor, not neutral. You say potato, I say pototo ......

It will catch you on a test though.