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- Ideomotor effect
- Imbert–Fedorov effect (optical phenomena)
- In-camera effect (filming) (special effects)
- Incidental effect (European Union law)
- Indirect effect (European Union law)
- Inductive effect (chemical bonding)
- Inert pair effect (atomic physics) (inorganic chemistry) (quantum chemistry)
- inertial supercharging effect (automobile) (engine technology)
- Inner-platform effect (anti-patterns)
- International Fisher effect (economics and finance) (finance theories) (interest rates)
- Inverse Doppler effect (Doppler effects) (wave mechanics)
- Inverse Faraday effect (electric and magnetic fields in matter) (optical phenomena)
Read more about this topic: List Of Effects