Engineering Abbreviations
"A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M",
"N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"

'Ha' to 'Hd', 'He' to 'Hz'

He - helium
HE11 mode - the fundamental hybrid mode [of an optical fiber]
HEMP - high-altitude electromagnetic pulse
HEMT - High Electron Mobility Transistor
HERP - hazards of electro-magnetic radiation to personnel
HET - Hetetodyne
HF - high frequency
HFDF - high-frequency distribution frame
HHD - Hybrid Hard Disk [HHD Manufacturers]
HIC - Heterogeneous Interconnect
HIC - Humidity Indicator Card
HIPPI - High-Performance Parallel Interface
HL - HubLink [bus]
HLL - high-level language
HMI - Human Machine Interfaces
hp - horse power
HPA - High Power Amplifier [HPA Manufacturers]
HPC - high probability of completion
HPI - Host Port Interface
HPIB - Hewlett-Packard Interface Bus [IEEE488]
HPXO - High Precision Crystal Oscillator
HSDPA - High-Speed Downlink Packet Access
HSIC - High-Speed Inter-Chip [USB HSIC]
HSPA - High-Speed Packet Access
HSSI - High Speed Serial Interface, [HSSI Description]
HSSTP - High Speed Serial Trace Port Specification
HST - High Speed TTL [Logic]
HSTL - High Speed Transceiver Logic
HTL - High Threshold Logic
HTML - HyperText Markup Language
HUD - Head Up Display
HV - High Voltage
HVIC - High Voltage IC
HWCI - Hardware Configuration Item
Hz - hertz

PC motherboard

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