DCD

DCD is a three-letter abbreviation with multiple meanings, including:

Data Carrier Detect, a term used with modems. Also see RS-232.
Direct conversion device, a device that directly converts energy from one form to another
Dead Can Dance is an originally Australian eclectic band, popular among goth music listeners.
Def Con Dos is a Spanish rap metal band.
Diamond Comic Distributors is the largest distributor (not publisher) of comic books in the United States
Developmental Coordination Disorders, also known as developmental dyspraxia, are characterized as being "clumsy" or "awkward".
Detroit Country Day is a private school without any religious affiliation in Beverly Hills, MI.
Design class diagram, a diagram used in software engineering.