It is said: If 13 people sit down to dinner together, all will die within the year.
The Turks so disliked the number 13 that it was practically expunged from their vocabulary (Brewer, 1894).
Many cities do not have a 13th Street or a 13th Avenue.
Many buildings don't have a 13th floor.
If you have 13 letters in your name, you will have the devil's luck (Charles Manson, Jeffrey Dahmer, Theodore Bundy and Albert De Salvo all have 13 letters in their names).
There are 13 witches in a coven.
ancient civilizations weren't unanimous in their dread of 13. The Chinese regarded the number as lucky, some commentators note, as did the Egyptians in the time of the pharaohs.
sources suggest the number 13 was purposely vilified by the founders of patriarchal religions in the early days of western civilization because it represented femininity. Thirteen had been revered in prehistoric goddess-worshiping cultures, allegedly, because it corresponded to the number of lunar (menstrual) cycles in a year (13 x 28 = 364 days). The "Earth Mother of Laussel," for example, a 27,000-year-old carving found near the Lascaux caves in France often cited as an icon of matriarchal spirituality, depicts a female figure holding a cresent-shaped horn bearing 13 notches. According to this theory, as the solar calendar triumphed over the lunar with the rise of male-dominated civilization, so did the number 12 over the number 13
Paraskevidekatriaphobia: Fear of Friday the 13th