- 北极熊 běijíxióng polar bearpolar bear; the large white bear native to the Arctic Circle
- 北极光 běijíguāng northern lightsaurora borealis; high-altitude lights appearing near the North Pole caused by solar particles interacting with the atmosphere
- 北极星 běijíxīng North StarNorth Star; Polaris; a bright star near the north celestial pole used for navigation and finding directions
- 北极圈 běijíquān Arctic Circlethe line of latitude at approximately 66.5 degrees north of the equator, marking the boundary of the north polar region
- 北极地区 běijídìqū the Arcticthe regions within the Arctic Circle, characterized by extremely low temperatures; including northern parts of Canada, Scandinavia, and Russia, along with Greenland and Alaska
- 南北极 nánběijí North and South Polesthe two ends of the Earth's axis of rotation, known as the North Pole and the South Pole, each located 90 degrees from the equator
- 北极海 běijíhǎi Arctic OceanOne of the world's five major oceans, located within the Arctic Circle between the northern coasts of Europe, Asia, and North America; also called [[北冰洋|北冰洋|bei3 bing1 yang2]]
- 北极狐 běijíhú arctic foxsmall fox native to the Arctic regions, adapted to cold climates with thick fur that changes color between seasons; also called [[白狐|白狐|bai2 hu2]]
- 磁北极 cíběijí magnetic north poleThe location to which a compass needle points, which differs from the geographic North Pole due to the Earth's magnetic field.
- 北极鸥 běijí'ōu glaucous gulla large bird found in the northern polar regions; scientific name Larus hyperboreus
- 北极星飞弹 běijíxīngfēidàn Polaris missileA type of nuclear missile launched from submarines, known for high mobility and safety of the launch platform.