Tag a collection of albums

I'd like to know if there is a specific tag that I can use to group several albums as a "mutti-CDs" album or as a collection. Is there a definite and recognized tag that is used for that?

I know that having the same album name across multi-CDs album can do the trick (just adding Disc1, Disc2... and also a subfolder name), but this is not practical at all: in the serach engines: all the directory of a multi-disc set look ther same and I have to go inside each of them 1 by 1 .... (subtitle of folder usually don't appear)

I'm aware that can still create a custom tag called "Collection" for example, taht I will use to group albums; but is there a tag that is aleady made for that and recognized by control points?

This is not related to Kid3 specifically but more to audio tagging. Since Kid3 seems to be THE tool on MacOS, I'm asking here; if I'm at the wrong place, could you please suggest a forum where I can ask such a question?

Thanks

Imported from SourceForge, author: bernardvictor