Certain numbers were considered sacred, holy, or magical by the ancient Egyptians, particularly 2, 3, 4, 7, and their multiples and sums.[1] [clarification needed]
The basic symbol for plurality among the ancient Egyptians was the number three: even the way they wrote the word for "plurality" in hieroglyphics consisted of three vertical marks (𓏼). Triads of deities were also used in Egyptian religion to signify a complete system. Examples include references to the god Atum "when he was one and became three" when he gave birth to Shu and Tefnut, and the triad of Horus, Osiris, and Isis.[2]
Fives are less common in Egyptian mythology.
The number seven was apparently the Egyptian symbol of such ideas as perfection, effectiveness, and completeness.