"C-note" is a slang term for a one hundred dollar banknote, where the "C" refers to the Roman numeral for 100, and was printed on $100 bills from 1869 to 1914.

"C-note" is a slang term for a $100 banknote in U.S. currency. The "C" in C-note refers to the Roman numeral for 100, which was printed on $100 bills, and it can also refer to a century.