👉 In mathematics, the term "zonality" refers to a property of certain complex numbers that allows them to be expressed as solutions to a polynomial equation. This is known as a zonal equation or a zonal polynomial. The concept of zonal properties was introduced by James Joseph Sylvester in 1896. He used this term to describe the ability of certain complex numbers, called "zonoids," to satisfy a particular type of polynomial equation. In other words, he showed that pol