- heat capacity
- heating surface
- heavy duration
- height specification
- heliocentric coordinates
- help
- help area
- help desk
- help display
- help file
- help function
- help menu
- help message
- help program
- help screen
- hemicompact
- hemimorphic
- hemmer shaft
- hemp rope
- hence
- heptagonal
- hereditary ring
- hereditary spectrum
- hereditary system
- heritable
- Hermitian form
- Hermitian matrix
- heteroclite
- heterogeneous
- heterotypical
- heuristic knowledge
- heuristic method
- hexadecimal notation
- hexagonal nut
- hierachical routing
- hierarchical directory
- hierarchical display
- hierarchical model
- hierarchical programming
- hierarchical relation
- hessian
- heterogeneous distribution
- heterogeneous multiplexing
- heterogeneous network
- heuristic
- heuristic approach
- heuristics
- hexagonal nomogram
- hexahedral
- hidden defect
- hidden file
- hidden line
- hidden periodicity
- hidden variable
- hierarchical notation
- hierarchy
- high byte
- high-order
- high-tech
- higher commutator
- highest
- highlighting filter
- highway traffic
- hinge joint
- hinged
- hingeless arch
- hiragana
- Histogram
- historical information
- historical view
- history
- hit
- hit rate
- hodograph plane
- hoisting shaft
- hold queue
- high capacity
- high contact
- high latitudes
- high performance
- high priority
- high spec
- higher level
- highspeed calculator
- highway
- history list
- hold
- hold mode
- hold relay
- Hollerith card
- hollow burning
- high curvature
- high geometry
- high technology
- higher algebra
- higher mathematics
- highlight
- hinged support
- historical data
- hit list