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 14 instead, to avoid unsettling tenants. The origins of this fear can be traced back to various historical and religious contexts. 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 throughout history.