The numbers three, five, and seven hold significant symbolic meanings in Freemasonry. They are often seen as foundational to the structure and philosophy of the Craft:
Three: This number represents the three degrees of Freemasonry: Entered Apprentice, Fellowcraft, and Master Mason. It is also associated with the three principal officers of a lodge and symbolizes harmony, friendship, and peace. The triangle, which is formed by three lines, is considered a perfect figure and represents the divine nature of God.
Five: This number is often linked to the five points of fellowship and the five senses. It symbolizes the human experience and the connection between the material and spiritual worlds. In geometry, it is associated with the pentagon, which represents the five elements of nature.
Seven: This number is regarded as sacred and is often associated with perfection. In Masonic tradition, a lodge is said to be perfect when it has seven or more members. The number seven also relates to the seven liberal arts and sciences, the seven steps of the Winding Stair, and the seven days of the week, symbolizing the completeness of creation.
As noted by James C. Stewart, "Three, five and seven are indicative of the three degrees, and the numbers correspond to the steps in the Masonic system". Furthermore, Albert Mackay emphasizes that "the tenary is the most sacred of all the mystical numbers" in Freemasonry.