Do you have friggatriskaidekaphobia or paraskavedekatriaphobia – fear of Friday the Thirteenth, or just or just triskaidekaphobia – fear of the number thirteen. You’re not alone. It’s not so much a fear these days as a superstition handed down through the generations.
No one knows exactly why 13 or Friday the 13th particularly is unlucky. In numerology, the number twelve is considered the number of completeness. Consider the things that come in twelves: months in a year; hours in a day; tribes of Israel, apostles (Judas was the 13th). Thirteen obviously throws off the whole and bad things happen.
Historically, the 13th Street and 13th Avenue are often omitted in street numbering; the 13th floor skipped in tall buildings. As if the not naming it 13 belies the fact that it is 13 carrying another label.
Personally, I have adopted it as a pseudo holiday. I don my all black attire, pat my black cat on the way out the door and wish everyone a happy Friday the 13th.