Common Terminology for 'limited' split horizon

DNS Admin for a very large company that is frequently involved in with mergers and acquisitions. I have finally been able to get a standard established that says no new 'unlimited' split horizon zones. The pain that full split horizon causes when merging/splitting businesses for M&A work is maddening, especially if the companies worked in any capacity together prior to M&A. So what we will support if pushed is having a designated internal only internal.example.com zone to handle anything that is needed for internal users and then have example.com as a full zone on external/public dns, we will not leak the presence of internal.example.com in the external view. So we would in effect be doing a targeted hijack of that slice of the name space

Does anyone have a clever/common name for this type setup. I want to have some 'standard' name for it that can be used in our standards/documents/etc. Most people know 'split horizon' here as unlimited internal and external view for a domain.