HAN (home area network)
HD (high-density)
HD-ROM (high-density read-only memory)
HDA (head disk assembly)
HDD (hard disk drive)
HDLC (High-Level Data Link Control)
HDTV (high-definition television)
HER (hard error rate)
HFC (hybrid fiber/coax)
HFS (hierarchical file system)
HID (human interface device)
HLF (high-level formatting)
HMA (high memory area)
HP (Hewlett-Packard)
HPA (host protected area)
HPFS (high performance file system)
HPT (high-pressure tin)
HRTF (head-related transfer function)
HST (High-Speed Technology)
HT (hyper-threading)
HTML (Hypertext Markup Language)
HTTP (Hypertext Transfer Protocol)
HVD (high voltage differential)
Hz (Hertz)
