divinatory trigram

卦 is composed of 圭 (jade tablet) and 卜 (divination). 圭 represents high ground, while 卜 depicts cracks on a tortoise shell. Thus, 卦 portrays the act of performing divination on high ground. Ancient people believed that high ground was closer to the heavens, making divinations more effective, so 卦 refers to the patterns or images obtained from divination.