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Internet and communication
Military and space
- Mark 24 Mine or FIDO, a U.S. acoustic homing torpedo used during World War II
- Fido Explosives Detector, a portable explosives detector
- Flight Dynamics Officer, a position in ground control of space missions
- Fog Investigation and Dispersal Operation, a fog dispersal system developed in the Second World War
- Roger Grosjean, an MI5 double agent (codename Fido) in World War II
- Fido Dido, a cartoon character associated with the soft drink 7-Up
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