DDD

DDD or Triple D may refer to:

Science and medicine

Defined daily dose, a World Health Organization statistical measure of drug use
Degenerative disc disease, a common disorder of the lower spine
Dense deposit disease, the preferred name for Membranoproliferative glomerulonephritis Type II
Dichlorodiphenyldichloroethane, a breakdown product of DDT
Dual pacing, dual sensing and dual response modes of a pacemaker
Depersonalization-derealization disorder, a psychiatric disorder involving feelings of oneself or the world being unreal, distant, or detached

Data Display Debugger or GNU DDD, a popular graphical user interface for command-line debuggers
Digital Divide Data, a social enterprise providing disadvantaged youths in Cambodia, Laos and Kenya with IT education and training
Direct distance dialing, a method for telephone subscribers to call long-distance numbers without operator assistance
DDD, the SPARS code for a CD that was recorded, mixed, and mastered digitally
Domain-driven design, a methodology and set of priorities for programming
Developer! Developer! Developer!, a series of community conferences for software developers
3D Systems (DDD), a company that makes devices for stereolithography or 3D printing