Belial's number is one, one being the number that represents earth and remaining firm to ones convictions. Bullheadedness in a good way! Belial's color is black, black being the color of the primordial chaos before the Earth. Most Luciferic sigils have black in them in some form representing the Earth.
Belial's element is Earth, Earth being the element that sustains humanity. The carnal laws of man are dictated by the laws of the Earth. Belial's direction is north, north being the representation of constantly striving forward and upward changing and recreating our Utopia bigger and better.
Belial's human element is remaining firm to ones own beliefs, not dancing around in pools of religious feces. Finding a philosophy which is your own and sticking to it.
Belial's altar element is the incense coal, representing Earth and (Wo)mankind holding the flame of Lucifer. Belial's planet is Earth, previously explained. Belial's highest manifestation is through understanding and living the natural laws of our carnal self, self explanatory.
The Belial Principle By Rev. Frederick Nagash