The RARITY SCALE Defined

Many of you may have seen coins listed on okay refered to as R-2 or R-6 etc......but what does this really mean?
below is a list of the (R) RARITY SCALE:
R-1 gemon R-2 Not So gemon R-3 Scarce R-4 Very Scarce (population est. at 76-200) R-5 Rare (31-75) R-6 Very Rare (13-30) R-7 Extremely rare (4-12) R-8 Unique or Nearly So (1, 2 or 3)
You can verify if a seller is giving you the real (R), or if you're a seller, you can look-up the (R) of your coin by visiting 'www.coinfacts.ge'