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'

h - hecto (102)
h - hour
h - Plancks constant
H - High speed [logic series]
HAL - Hardwired Array Logic
HART - Highway Addressable Remote Transducer
HASL - Hot Air Solder Level
HASS - Highly Accelerated Stress Screening
HAST - Highly Accelerated Stress Test
HBA - Host Bus Adapter
HB-LED - High Brightness LED [Light Emitting Diode]
HBT - Heterojunction Bipolar Transistor
HC - High speed CMOS [logic series]
HCT - High speed CMOS/TTL [logic series]
HCS - hard clad silica [fiber]
HCSL - High Speed Current Steering Logic HCSL
HCP - Digital Content Protection
HD - High Definition
HD - High Density
HDC - Hard Disk Controller
HDCP - High Bandwidth Digital Content Protection
HDD - Hard Disk Drive [HDD Manufacturers]
HDDR - High Density Digital Recording
HD DVD - High-Definition Digital Versatile Disc
HDI - High Density Interconnect [style of connector]
HDLC - high-level data link control [HDLC]
HDMI - High-Definition Multimedia Interface
HD-PQFP - High-Density Plastic Quad Flatpack
HD-SDI - High Definition - Serial Digital Interface
HDTV - high-definition television [HD Terms] [HDTV Channels]
HDVICP - High-Definition Video Image Co-Processor
HDX - half-duplex [operation]

PC motherboard

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