HD
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HD represents, among other things:
- The American poet Hilda Doolittle
- High Definition media formats, for instance HDTV (high definition television) or the HD-DVD format
- Hard disk or hard drive, a type of computer storage hardware
- Harley Davidson, an iconic American motorcycle manufacturer
- The Home Depot, a chain of home improvement warehouse retailers
- Home Depot's ticker symbol on the New York Stock Exchange
- Hyperactivity Disorder, as in Attention-deficit hyperactivity disorder (AD/HD)
- High Density (in reference to a floppy disk or other magnetic media)
- Higher Diploma a type of academic award.
- The Henry Draper star catalogue
- Hodgkin's disease
- Huntington's disease