1. Floating pool or bath toy
2. In amateur radio, a rubber coil antenna usually found on handheld radios and portable rigs
3. In military training, a fake rifle used for movement drills and ceremony
1. She took the rubber duck and made it squeak by squeezing it.
2. I threw away the shitty rubber duck on my handheld radio and bought a whip antenna.
3. Put all the rubber ducks in the back of the truck and bring it over to the field.