Nan, from boat, refers to a floating object. From five, a metaphor for change, in the case of the boat, refers to the freedom of change. From vertical, a metaphor for standing, a pictorial pointer, to point to the fixed and unchanging for standing, implying a guide. The appearance of the oracle bone character Nan proves the existence of the compass. The invention and application of the compass will only be earlier than the text, which puts the invention of the compass time, a big step forward. The invention of physical objects in the first, belongs to the instrument, is metaphysical, the creation of words in the latter, belongs to the Tao, is metaphysical. From the word south, can prove that the ancient Chinese culture and civilization, a long history, incomparable glory, which is the glory of Chinese civilization, but also the pride of the Chinese children.