From Citizendium, the Citizens' Compendium
- Bird : The class of animals (aves) that can be distinguished from all other living animals by the presence of feathers.
- Arctic Ocean : The sea around the Earth's North pole.
- Open Polar Sea : A hypothesized ice-free ocean surrounding the North Pole, now known to have not existed.
- Tux : The name of the penguin, official logo and cartoon mascot for the Linux computer operating system.
- Kongsberg Penguin missile : A Norwegian-designed anti-shipping missile, designated AGM-119 Penguin in U.S. service, which can be launched from helicopters, fixed-wing aircraft, ships and ground vehicles