What "IVI" from "IVI Translation" stands for?

Question

In several documents in the context of IPv4/IPv6 transition I see these three letters "IVI" that seems to be an acronym, but I was unable to find what it means or suppose to refer.

Maybe is it a reference to something in language different than english? Ip Versus Ip? Any thoughts?

Some references:

• IVI Translation at Wikipedia
• RFC6219
• IVI website maintained by China Education and Research Network

Answer 1

This document presents the CERNET IVI translation design and
deployment for the IPv4/IPv6 coexistence and transition.  In Roman
numerals, the "IV" stands for 4, and "VI" stands for 6, so "IVI"
stands for the IPv4/IPv6 translation.

RFC 6219 Sec 1

So (4) IV plus (6) VI == I[VV]I with the duplicate "V" removed.