The term 'STATE QUARTERS' refers to a series of coins issued by the United States Mint from 1999 to 2008. The coins featured designs depicting each of the fifty U.S. states on their reverse side. The crossword solution for this term is 'DORM, ' which is an abbreviation for the word 'DORMANT, ' meaning inactive or not in use. This is an appropriate description for the STATE QUARTERS series, as it has been inactive since 2008.