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- double extragalactic radio source
- double face leather
- double factorial
- double fan graph
- double fertilization
- double fibration
- double-firing
- double fission
- double-flow
- double flower
- double flow passage impeller
- double-focusing spectrometer
- double folding potential
- double folium
- double-free set
- double galaxy
- double gamma-function
- double gate
- double-gate FET
- double gate field-effect transistor
- Double Gauss Lens
- double-Gauss lens
- double Gauss objective
- double gimbal control moment gyro
- double-glazed PV module