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Posted By: barrysloate

In numismatics, they use terms such as "rare" and "exceedingly rare" not merely as adjectives, but as specific references for how many of a certain coin is known to exist. We could even create our own scale:

Exceedingly Rare= Four Base Hits
Very Rare= T208
Rare= E107
Very scarce= E103, N175
Scarce= T204, E93
Common= T205, T206

Obviously, many more examples could be found for each category, and of course there would be some disagreement, but at least we could begin to assign real meaning to a rarity scale, instead of using the term as a marketing tool to sell almost anything.