The Egyptians represented the earth as a four-sided house where three gods lived. This added to equal seven which they therefore considered lucky. Throughout time numbers have gained special meanings, like in this little English rhyme about crows. But seven is the devil's own self. Two represented opinion, divisibility, sociability, and the moon.
All religious symbols are in threes .
Four sides make a square, foundation of all things, as the four points of a compass and the four seasons. Five meant fire, love, and marriage. Six equals one plus two plus three, and therefore represents creation, and considered a perfect number. The number nine is associated with magic because three times three equals nine, and if you multiply any number by nine, the digits of the answer add up to nine. Nine knots were tied in prayer shawls, and nine appeared in some ancient amulets.