- double helix
- double helix model
- double helix structure
- double heterostructure
- double hole scheme
- double hook type netting machine
- double-hours
- double-humped
- double-humped barrier
- double-humped profile
- Double Hundreds Policy
- double image
- double image coincide measuring distance
- double-image prism
- double implication
- double inclusive process
- double inflection
- double insulation
- double insurance transmission for the llve broadcasting signal
- double integral
- double integrating accelerometer
- double integration
- double interferometer
- double interpolation
- double interval censoring