HD

Encyclopedia : H : HD : HD : HD

HD may refer to:

''See also:

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Contents

1 Science and technology
2 Role Playing Games (primarily Dungeons and Dragons):
3 Business
4 Medicine
5 Other

Science and technology

Hard disk, or hard drive, a type of computer storage hardware (also HDD for hard disk drive)
Henry Draper Catalogue, a sequential numbering system for stars ordered by right ascension
High-definition as in video (HDTV) or audio
High Density, in reference to a floppy disk, other magnetic media or the new optical format HD DVD.
Hybrid drive, a type of notebook hard drive that utilizes a large buffer

Role Playing Games (primarily Dungeons and Dragons):

Hit Dice how many dice of hit points your character has, an indication of his or her health and durability.

Business

Harley-Davidson, an iconic American motorcycle manufacturer
Home Depot, a chain of home improvement warehouse retailers

Medicine

Attention-deficit hyperactivity disorder, known as Hyperactivity Disorder (HD), as in AD/HD
Hodgkin's disease
Hormone disruptor
Huntington's disease
HD, a human gene that makes a protein called huntingtin which plays an important role in Huntington's disease
Hip Dysplasia

Other

Higher Diploma, an academic award.
Hilary Duff, a music artist.
Hokkaido International Airlines (also known as Air Do), IATA airline designator
Hilda Doolittle, also known as H.D., American poet
Mustard gas

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