If a US coin has the letter "S" printed on it, it was minted in San Francisco; a "D" means it was made in Denver; no letter at all means it was minted in Philadelphia.

The odds against a flipped coin coming up with the same side showing ten times in a row are 1,023 to 1.

The mill, equal to one-tenth of a cent, was declared the lowest money of account by the US Congress in 1786. The mill, as a coin, was never minted.

"E Pluribus Unum," the Latin expression appearing on US currency, means "one out of many."

Abraham Lincoln was carrying Confederate money when he was assassinated.