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指南針是利用磁鐵在地球磁場中的南北指極性而製成的一種指向儀器，有多種形體。戰國時期，已發現磁石吸鐵的現象，並用天然磁石製造“司南之勺”，“其柄指南”。此後,經過長時期的實踐,發現人工磁化的方法，造成更高一級的磁性指向儀器。
2 中國四大發明之二——指南針（1 / 3）