Satoshi Millionaire is one, who has 1 million Satoshi, i.e. 0.01 BTC.
There was a time when new entrants wanted to reach goal of 21 BTC, i.e. one in a million.
I'd rather call myself a pennyaire.
Don't forget about the Vladimir Club. Back in the day, the goal used to be 2,100 BTC!
Is this really a thing now?
I don't think so. The "21 Million Club" (owning 1 bitcoin) seems to be a more common goal.