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H/M
Hotel/Motel
HA
Horn Alert
HACK
Hacking And Computer Krashing
HAGS
Herbally Aroused Gynecological Squad
HALE
Hacker's Against Law Enforcement
HAP/PA
North America Pirate/Phreak Association
HASH
Humans Against Society and Homework
HATE
Highly Artistically Talented Enterprises
HBD
Hybrid
HBO
Home Box Office
HCDS
High Capacity Digital Service
HCF
Halt and Catch Fire
HCH
Hardcore Hackers
HCIG
Health Care Industry Group
HCSDS
High Capacity Satellite Digital Service
HCTDS
High Capacity Terrestrial Digital Service
HDA
Head Disk Assembly
HDK
Hippy Dippy Klub
HDLC
High-Level Data Link Control
HDSC
High-Density Signal Carrier
HDTV
High Definition Television
HDX
Half Duplex
HEAP
Home Energy Assistance Program
HEAT
Hackers Enterprising Across Telecommunications
HEHO
High End Hop Off
HEMP
Hardcore Elite Mother Phuckers
HEPNET
High Energy Physics Network
HF
Hands Free
HIC
Hybrid Integrated Circuit
HIT
Hackers In Touch
HLI
High-speed LAN Interconnect
HLL
High Level Language
HNPA
Home Numbering Plan Area
HNS
Hospitality Network Service
HOBIC
Hotel Billing Information Center
HOBIS
Hotel Billing Information System
HP
Hewlett-Packard
HPA
Hacker/Phreakers Association
HPO
High Performance Option
HPS
Hardware Product Services
HPS
High Performance Systems
HQ
Headquarters
HR
High Rezolution
HRU
Hackers 'R' Us
HSC
Hierarchical Storage Controller
HSGMT
High Speed Global Mass Trading
HSSDS
High-Speed Switched Digital Service
HST
High Speed Technology
HU
High Usage
HUTG
High Usage Trunk Group
HVM
High Volume Manufacturing
HW
Hardware
HZ
Hertz