Tui is the Eighth and final Trigram. It is also the Fourth and final Yin Trigram. The Yin Principle has risen to the top, above Two Yang lines. The interpretation of Tui is at best, tricky and paradoxical. TuiMeans "The Joyous", and refers to a marsh or valley.
Fu Hsi placed Tui in the Southeast, representing early Summer, and the Third daughter. The Pagan/Wiccan festival corresponding to this Time is Beltane, which we call “Mayday”. This Time is celebrates the flowering and richness of nature.
Emperor Yu had Tui in the West, representing an aspect of Metal. In both arrangements, Tui is next to Chien.
Modern Kabbalah correlates Tui with Chesed and the Planet Jupiter.
Confucius says about Tui:
Tui shows a third application of Chien to Kun, resulting in the begetting of its female Third divided line, and hence is called the youngest daughter. Tui suggests pleasure and satisfaction, the emblem of a low-lying collection of water; of the youngest daughter; of a sorceress; of the mouth and tongue; of the decay and putting down (of things in harvest); of the removal of fruits hanging from the stems or branches; among soils, of what is strong and salt; of a concubine; and of a sheep. God rejoices in Tui.
You may have noticed, perhaps, that there is a mixture of Positive and Negative Imagery here. Tui is, at the same Time, the Sign of Joy, Magic, Sexuality, and First Fruits. The Word “Mayday” (repeated three times) a transliteration, actually, of the French “M’aidez”, (Help me!) is also used as an international distress call. The contrast between this usage and the Spring Holiday is similar to the ambiguity in interpreting the meaning of Tui.
An Ancient Tradition ascribes the Name “Na'el” to the wife of Ham, Noah’s third son. This Name means “triumph”, or “one who ascends to God”.