南极 (nán jí) literally means 'south extreme' — 南 (nán) means 'south', and 极 (jí) means 'pole' or 'extreme end'. Together, they refer specifically to the geographic South Pole, the southernmost point on Earth’s axis of rotation. It is located in Antarctica and is distinct from the magnetic south pole. The term is used in geography, climate science, and exploration contexts.

In everyday Chinese, 南极 often appears in discussions about polar research stations, wildlife (like penguins and seals), ice melt, and global climate change. While it can occasionally be used metaphorically to mean 'the farthest southern point', its primary meaning is strictly geographical and scientific. It is a proper noun and always capitalized in English translations, though Chinese writing has no capitalization rules.