13 ~ Wheel of Birth, Death & Rebirth

Number that cleans and purifies.

The number 13 brings the test, the suffering and the death. It symbolizes the death to the matter or to oneself and the birth to the spirit: the passage on a higher level of existence.
For the superstitious, this number brings the bad luck or the misfortune.
For the cabalist, the number 13 is the meaning of the Snake, the dragon, Satan and the murderer. But it is also for Christians the representative number of the Virgin Mary, she whose mission is to crush the head of Satan.
Number in relation with the cross and also to the family, since by reduction we obtain four: 1 + 3 = 4.

It is the element of too, that which makes pass from a cycle to another with what this change implies of anxieties by the arrival of a new unknown cycle.
Represents the eternal love illustrated by Jacob and his twelve son, Jesus-Christ and his twelve apostles.

If we consider 13 as a wheel to 12 rays, that is to say as 12 units around a center, it is beneficial. If we take it as prime number, it is maleficent. It is especially maleficent when we are at table and when one believes in his power. But, as observed judiciously Grimod: "The number 13 is to be feared only insofar as there would be to eat only for twelve."
If we represent 12 under the form of the Zodiac, 13=12+1 is the number of the eternal return. The 13th hour is also the first, just like the 25th or the 37th.

http://www.ridingthebeast.com/numbers/nu13.php