Odd money is a term used to describe small amounts of coins or bills that are not a part of a standardized monetary system. It can refer to any coins or bills that are unusual or not commonly used. Synonyms for odd money include small change, pocket change, spare change, loose change, and coinage. These terms are often used interchangeably with odd money to describe small amounts of money that are not enough to make a significant purchase. Regardless of the term used, odd money is often left to accumulate in pockets or jars and is frequently used to make donations or tips.