What does HCU stand for?

Hand Craft Boats, Groveland, FL - Manufacturer code for watercraft hull identification number (USCG)

Handheld Computer Unit

Harbor Clearance Unit - Navy (NVT)

Harbor Control Unit

Hard Copy Unit

Health Care Unit - DoD (GFGA)

Heavy Conversion Unit - British military (DMA)

Helicopter Control Unit (NVT)

Helium Charging Unit (AAG)

Hoist Control Unit (SAUS)

Home Computer User (VLIE)

Homing Comparator Unit (AAG)

Homocystinuria - Medicine

Horse Canyon - Utah - Seismograph station code, US Geological Survey (SEIS)

Humanitarian Coordination Unit (SAUO)

Hydraulic Charging Unit (NASA)

Hydraulic Control Unit - Nuclear energy (NRCH)

Hydraulic Coupling Unit - Automotive engineering

Hydraulic Cycling Unit (AFM)

Hyperplasia Cystica Uteri - Medicine (DMAA)

Hypertape Control Unit (SAUS)