The letter on a penny refers to the mint at which it was manufactured. P is Philadelphia, D is Denver.
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Perception.
None, all mint is defined by a P or a D (Pennsylvania or Delaware)
The letter on quarters represents which mint facility produced the coin. "P" stands for Philadelphia Mint and "D" stands for Denver Mint. These marks help identify where the coin was minted.
Perception Perception
Please rephrase question.
The Philadelphia mint (where the coin was made).
its a mint mark, the letter indicates where the coin was made P = Philadelphia, D = Denver
The "P" is the mintmark of the Philadelphia Mint. All U.S. coins from 1980 to 2012 made at this mint have a "P" mintmark. It's just a nickel, spend it.
The capital letter on each US coin tells you at which mint it was made; P is for the Philadelphia mint, S is for the San Francisco mint, and D is for the Denver mint. See the related question below.
H is the abbreviation on the table of elements. The 'chemical symbol' for hydrogen is H.