The fear of Friday the 13th is known as friggatriskaidekaphobia or paraskevidekatriaphobia. Both terms are used to describe the fear or superstition associated with this specific date. The word "friggatriskaidekaphobia" combines "Frigga," the Norse goddess associated with Friday, with "triskaidekaphobia," which means fear of the number 13. "Paraskevidekatriaphobia" combines "paraskevi," the Greek word for Friday, with "dekatria," which means 13 in Greek, and "phobia," meaning fear. Both terms represent the anxiety or unease some people experience regarding Friday the 13th.