Coin Collecting Glossary
Learn the terms every collector should know
Coin Collecting Glossary (Numismatic Terms)
Welcome to the Coin Nerds Numismatic Glossary — a complete guide to coin collecting terms for beginners and advanced collectors alike.
Browse definitions below and click any term to learn more in-depth.
BU (Brilliant Uncirculated)
A coin that has never been in circulation and retains its original mint luster.
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Red (RD)
A designation for copper coins that retain their original red color, indicating minimal oxidation.
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Mint Mark
A small letter on a coin indicating where it was produced (e.g., D for Denver, P for Philadelphia).
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Wheat Penny
A Lincoln cent minted from 1909–1958 featuring wheat stalks on the reverse.
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Obverse
The front side of a coin, typically featuring a portrait.
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Luster
The way light reflects off a coin’s surface, indicating its condition and originality.
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Circulated vs Uncirculated
The difference between coins that have been used in everyday transactions and those that remain in original mint condition.