hub and spokes system

direct and overdrive clutch hub

hub assembly

portal hub

clutch disk hub

idler wheel hub cap

worm-wheel hub

fan hub clutch

hub brake

hub disk

hub guard

hub stud

anti-torque rotor hub

hub-tip ratio

main rotor hub

split wheel hub

wheel hub

wheel hub integral flange

main-rotor head / main-rotor hub

main-rotor hub / main-rotor head

rotor hub

tail rotor hub

hub

key rail hub

fire extinguishing system sprinkler system and fire alarm system

attitude-and-heading reference system / attitude and heading reference system (AHRS)

observation and fields of fire, avenues of approach, key and decisive terrain,obstacles, and cover and concealment (OAKOC)

Space System for Tracking Ships and Aircraft in Distress – Search and Rescue Satellite (COSPAS-SARSAT)

merchant ship communication system (mercomm system)

multiple launch rocket system (MLRS); multiple rocket launcher system

Air Force weapons system / AF weapon system

selective calling system, SELCAL system

Unmanned Aerial System / Uncrewed Aircraf System (UAS)