The number 13 is often considered unlucky in various cultures, a belief known as triskaidekaphobia. This superstition may stem from historical events, such as the Last Supper, where Judas Iscariot was the 13th guest, leading to negative associations with the number. In modern society, the fear of 13 can manifest in buildings that skip the 13th floor or airlines that avoid row 13. Despite its negative connotations, some cultures view 13 as a symbol of good fortune, highlighting the diverse interpretations of this number around the world.