HD

Acronym for Heavy duty.

HDC

1. Acronym for hill descent control -- A system employed on newer 4x4 vehicles which allow them to proceed down a hill more slowly so that the wheels won't lock up.
2. Acronym for Heavy Duty Cooling

HDPE

Acronym for High-density polyethylene

HDR

Acronym for High Data Rate

Hdtp

Abbreviation for Hardtop.

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