half - hier
- heterarchical
- heterarchical control
- heterarchy
- heterochromatic X-rayss
- heterodyne detector
- heterogeneous
- heterogeneous alloy
- heterogeneous computing
- heterogeneous junction
- heterogeneous X-rayss
- heterojunction laser
- heterostructural
- heterostructure laser
- heterosystem
- heuristic
- heuristic knowledge
- heuristic logic
- heuristic thought process
- heuristics
- Heusler alloy
- hex
- hex bar
- hex nut
- hex stock
- hex washer head
- hex-shaped
- hexagon
- hexagon broach
- hexagon fit bolt
- hexagon head
- hexagon head with collar
- hexagon head with flange
- hexagon head with washer face
- hexagon key
- hexagon set screw
- hexagon socket head screw
- hexagon socket set screw
- hexagon thin nut
- hexagon turret head
- hexagon-head bolt
