Triskaidekaphobia (from Greek tris meaning “3”, kai meaning “and”, deka meaning “10” and phobos meaning “fear” or “morbid fear”) is fear of the number 13 and avoidance to use it; it is a superstition and related to the specific fear of the 13th person at the Last Supper being Judas, who was said to have stabbed Jesus Christ in the back (metaphorically). It is also a reason for the fear of Friday the 13th, called paraskevidekatriaphobia (from Παρασκευή Paraskevi, Greek for Friday) or friggatriskaidekaphobia (after Frigg, the Norse goddess after whom Friday is named in English).
The term was first used by Isador Coriat in Abnormal Psychology.
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