A style of parallel prose characterized by sentences consisting mainly of four and six characters; it emerged during the Southern Dynasties and reached its height during the Tang and Song Dynasties.

Common name for umbilical tetanus in newborn babies, occurring typically four to six days after birth; usually caused by infection during umbilical cord cutting.

A style of rhythmic writing where most sentences consist of four or six characters arranged in pairs.

a solid figure with twenty-four faces, specifically a cube where each face is replaced by a low pyramid; often refers to a crystal form in the isometric system