The kanji for KI means spirit. It comes from the X character (201) in the lower center, meaning rice. The radical to the top and leading down to the right represents vapor. Together they originally indicated the vapors rising from cooked rice and now indicate the idea of spirit or unseen force. Today it is generally used to indicate an invisible, spiritual energy or life force.
(text source> http://www.budodojo.com/AiKiDoKanji.htm

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