DSD

DSD can refer to:

Direct Stream Digital, a method of storing audio on digital media;
Defence Signals Directorate, an Australian intelligence agency.
Data structure diagram, a visual representation of the physical data structure of a database, showing tables, fields, foreign keys, primary keys, relationships, etc.
Direct Store Delivery, delivery directly from a manufacturer to a store, bypassing a warehouse.
Document Structure Description, a schema language for describing valid XML.
Dry sterile dressing, used for covering wounds