MAC address part names: CID, OUI, VID
 

I have seen different names for the two parts of a MAC address.
For example:
08:00:20:a3:25:19

08:00:20 - can be called company-id (CID) or Organizationally Unique Identifier (OUI)
a3:25:19 - can be "Device Identifier", "Network Interface Controller (NIC) Specific," "vendor-supplied identifier" (VID), and maybe others.
Appendix A of RFC 4291 (https://tools.ietf.org/html/rfc4291) uses "company_id" and "vendor-supplied id".
IEEE uses OUI or CID for the first part, with explanation for each. I didn't find anything here for the second part (http://standards.ieee.org/develop/regauth/tut/eui.pdf)

I'm wondering if there is a "correct" convention.
Is CID ok for the first half of the MAC address (08:00:20) and is VID ok for the second half (a3:25:19)?

Thanks.

The first half is important because it indicate what vendor provide the device. Second half just has one requirement, no duplication.