CMB Commercial, Fort Myers, FL - Manufacturer code for watercraft hull identification number (USCG)
Halogenated Dibenzodioxin - Organic chemistry
Hard Disk Drive - Computer science
Head-Down Display - Aviation
Headsdown Display
Heating Degree Days - Agriculture
Heavy-Duty Detergent
Heavy-Duty Diesel - Vehicle
Heavy Duty Distribution - A publication
Henrion & Dassy - NCIC firearms make code (NCIC)
High Definition Display (SAUS)
High-Density Data (KSC)
High-Density Disk - Computer science (ITCA)
High-Dosage Depth - Medicine (DMAA)
Higher Dental Diploma - British
Homopolar Disk Dynamo
Hoop De Doo Revue - Disney (DIS)
Horizontal Directional Drill - Off-Highway equipment
Housing Development Directorate (SAUS)
Human Disorientation Device
Hyderabad - Pakistan - Airport symbol (OAG)
Hydrogen Donor Diluents - Petroleum chemistry
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