Mnemonic for the Eight Trigrams 八卦口诀

乾三连
坤六断
震仰盂
艮覆碗
离中虚
坎中满
兑上缺
巽下断

Qian = 3 full lines
Kun = 3 broken lines
Zhen = upright bowl image
Gen = inverted bowl image
Li = middle in centre
Kan = filled in the middle
Dui = opening at the top
Xun = opening at the bottom