Coin Glossary

You can find most popular coin collecting phrases in this coin glossary.

Coin Glossary

U

unc or unk or UN - abbreviation for uncirculated.

uncirculated or un-circulated - a new condition coin that does not have any sign of wear. Marks on the coin that may come from the manufacturing process do not keep a coin from being un-circulated. (Example, bag marks.) Even the slightest amount of wear or cleaning will keep a coin from grading uncirculated.

upsetting mill - machine used in coin production to raise the rim on both sides of a blank (planchet).

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Coin Collecting News
06/30/2025
Bianca Valerio wins Pasadena council seat following coin toss
A coin toss determined a tiebreaker between incumbent Bianca Valerio and her challenger, Bruce Leamon, for Pasadena's District B council seat. more info

06/30/2025
The flip of a coin today will determine who sits on the Pasadena City Council | We'll stream coin flip LIVE on KHOU 11+
Breaking the tie comes down to a coin flip. That coin flip will take place today at Pasadena City Hall at 11 a.m. So, if you ever wanted a reminder that every vote counts, remember this race! And ... more info

06/29/2025
Coin Ingestion in Kids: 1 in 4 Pass Without Intervention
New data suggest mid/distal esophageal coin retention in kids often resolves without intervention — prompting reconsideration of removal timing. more info