The fear of the number 13 is known as triskaidekaphobia. This superstition is prevalent in many cultures, where the number is often associated with bad luck or misfortune. For example, some buildings skip the 13th floor, labeling it as the 14th instead, to avoid unsettling tenants. The fear may stem from various historical and cultural beliefs. In Christianity, the number 13 is linked to the Last Supper, where Judas Iscariot, the betrayer of Jesus, was the 13th guest. This association has contributed to the negative perception of the number, leading to widespread avoidance in various aspects of life.