the six historical styles of writing kanji: large seal, small seal, clerical, triangular-swept clerical, running, and cursive
the Six Kingdoms (of China's Warring States period: Qi, Chu, Yan, Han, Wei and Zhao); the six tree-derived incense varieties used in kōdō ceremonies
Six Dynasties (of China: Eastern Wu, Eastern Jin, Song, Qi, Liang, Chen); calligraphic style of the Six Dynasties period
six forms of the Shi Jing (genre: folk song, festal song, hymn; style: narrative, explicit comparison, implicit comparison); six forms of waka (allegorical, enumerative, metaphorical, allusive, plain, congratulatory); six principles of calligraphy; six classes of kanji characters
two books on the art of war in ancient China; the secrets (essence) of the art of war; secrets of successful life; precepts for living
six ministries (of Zhou-dynasty China)
the six classes of (kanji) characters; Hexateuch (first six books of the Hebrew Bible)
yin, yang, wind, rain, darkness, light; cold, heat, dryness, dampness, wind, fire; six emotions (joy, anger, sorrow, pleasure, love, hate)
Six Ministries (in Sui-dynasty to Qing-dynasty China)
six ministers (of the six Zhou-dynasty Chinese ministries)