D
D is a versatile abbreviation that can stand for day, digital, data, or even the word "the" in shorthand, and is sometimes used informally for dog.
Medical
Miscellaneous
Day
Degree
Deka
Denise
Duration
Drag
Dog
Dahlonega, Georgia (mint mark on United States gold coins)
Dean
Dealer
Dinner
Donald
Devin
Dubyah
Dontae
David
Deci-
Denver, Colorado (mint mark on United States coins)
Dad
Community
Governmental
Diesel
Defenseless
Dallas
Department
Dungeon
Dynamite
Distance
Dragoons
Denied
Diligent
Disputation
Driver
Driving
Detective
Deck
Delivery
Down
Drift
International
Academic & Science
Diamond
Direct
Dense
Dilute
Discourse
Digital
Depth
Delta
Dynamic
Deuterium
Died
Doctorate
Dropped
Doublet
Distinction
Decayed
Deep
Diploma
Diode
form D (make-before-break) contacts
Daughter
500
Computing
Business
Dominion Resources, Inc., of Virginia
Disciple
Development
Dreamer
Disposable
Dull
Dangerous
Defective
Dundee Real Estate Investment Trust