DDD can refer to, among others: · Data Display Debugger, a popular graphical user interface for command-line debuggers · Delta Delta Delta, a national collegiate sorority · Direct distance dialing, a telephony innovation that enabled subscribers to call long distance numbers without having to go though an operator · Die deterioration doubling, a common form of mint-made error on coins that results from degradation of the die used to strike the coin · Defined Daily Doses - a World Health Organisation statistical measure of drug use · SPARS Code for "Digital, digital, digital", a "pure digital" recording that is recorded, mastered, and transferred digitally · Direct Digital Disc, a common misconstruance of the "Digital, digital, digital" SPARS Code · DDD , by Poster Children named after the pure digital recording process · Dichlorodiphenyldichloroethane, a breakdown product of DDT