It would seem that the C12K is the name most use for them today.
PHIG is another one many use nowadays. That I really don't like.
I, however, would definitely prefer it to be called the Guangxi hone or finisher
Sadly that will never stick either, people are just too focused on putting a number on all natural hones.
If not in the name, most certainly in understanding and reference.
Ah well, it's still just yet another piece of rock.