the Sixty-Four Hexagrams) — is the system of 64 double-trigrams (hexagrams) in the I Ching (Zhōu Yì). Each hexagram is made up of six lines (yao), either solid (Yang) or broken (Yin), read from the bottom upward (from the First/Bottom Yao to the Top Yao). The system symbolizes the laws of cosmic transformation and ordinary affairs, and is used to divine and interpret auspiciousness and misfortune, success and failure, by combining the eight basic trigrams (Ba Gua). It also embodies deep philosophical meanings about heaven, earth, humanity and all things.