Now you can put a name to your phobia. You likely already know the term triskaidekaphobia, which only applies to the fear of the number 13. But for specific fears of Friday the 13th, you can choose between
paraskevidekatriaphobia (Paraskevi meaning Friday in Greek) or friggatriskaidekaphobia, based on the word Frigg, the Norse goddess that Friday was named after in English. (It was her son who Loki had killed…)
The folks of French Lick, Indiana. (Larry Bird's hometown) are apparently a superstitious lot. In the 1930s and extending into the '40s, the town board decreed all black cats in the town were to wear a bell around their neck every Friday the 13th. Apparently, the confluence of two popular phobias was a bit too much for the small Indiana town to handle.