Net Grading	Refers to a compromising method of grading a coin. For example, if a particular coin's OBVERSE grades MS65 but its REVERSE only warrants a grade of MS63, then the dealer/grader might label the coin MS64. It may also refer to a coin which might otherwise grade MS65 but has been cleaned so it isn't graded MS62.
New	A term for a coin that never has been in circulation.
New Orleans	The branch Mint was established in 1838 in New Orleans, Louisiana. It struck coins for the United States until its seizure in 1861 by the Confederacy. (Some 1861-O half dollars were struck after the seizure.) It reopened in 1879 and struck coins until 1909 (actually closed in 1910). Now, this facility is a museum.
New Orleans Mint	The New Orleans opened its doors in 1838 and closed in 1942. This mint uses the “O” mintmark.
NGC	Numismatic Guaranty Corporation
Nickel	A popular term for a five-cent piece struck in a cupro-nickel alloy(actually 75% copper, 25% nickel).
No “CENTS” nickel	Those Liberty Head or “V” nickels struck in 1883 without a denomination. This was very confusing to the public and led to the “racketeer” nickel scandal.
No Arrows	A term applied to coins without arrows by their dates during years when other coins had arrows by the date.
No Motto	Coins struck without the motto, “IN GOD WE TRUST.” This motto was mandated by an act of Congress and appeared on nearly every United States coin since the 1860s. (Teddy Roosevelt felt this was disrespectful and had it removed from the 1907 eagles and double eagles. Citizen protests soon were overwhelming and it was reinstated in 1908.) This also refers to coins struck before the motto was added in the 1860s.
No Stars	Term applying to the Christian Gobrecht designed Liberty Seated coins that do not have stars.
No-grade	A term applied to a coin returned from a third-party grading service that was not encapsulated, because of varying reasons. (This could be for cleaning, damage, questionable authenticity, etc.) This no-grade is still charged.
Numerical Grading	Specifically, the Sheldon 1-70 scale is employed by PCGS and others.
Numismatics	The science of money; coins, paper money, tokens, inscribed bars, and all related items are included.
Numismatist	Any person who is interested and studies or collects money or substitutes thereof. This term describes anybody who is serious about coin collecting, grades, catalogues or selling coins for a living.
Numismatic Guaranty Corporation	Third-party grading service based in Parsippany, New Jersey.

If we missed a word or phrase, please let us know. We would like to grow and expand this list with your help.