It is possible this is a internal code, a typo for a different project name, or a very new niche topic.
It could be:
The "012" may be a variation or specific reference to fan-curated collections, volume numbers, or the total number of original group members (9) plus specific anniversary markers, though "Sone Note" is the primary official "exclusive" associated with the fandom name. Key Details of Sone Note Exclusives : These were members-only booklets released by S.M. Entertainment Universal Music Japan sone012 exclusive