Universal+Rarity+Scale

URS-0 None known URS-1 1 known, unique URS-2 2 known URS-3 3 or 4 known URS-4 5 to 8 known URS-5 9 to 16 known URS-6 17 to 32 known URS-7 33 to 64 known URS-8 65 to 125 known URS-9 126 to 250 known URS-10 251 to 500 known URS-11 501 to 1,000 known URS-12 1,001 to 2,000 known URS-13 2,001 to 4,000 known URS-14 4,001 to 8,000 known URS-15 8,001 to 16,000 known URS-16 16,001 to 32,000 known URS-17 32,001 to 65,000 known URS-18 65,001 to 125,000 known URS-19 125,001 to 250,000 known URS-20 250,001 to 500,000 known etc.