The number 13 is often considered unlucky in many cultures, leading to a superstition known as "triskaidekaphobia." This fear can manifest in various ways, such as the omission of the 13th floor in buildings or the avoidance of scheduling events on the 13th day of the month. The origins of this superstition are unclear, but some theories suggest it may stem from religious beliefs, such as the presence of 13 individuals at the Last Supper, where Judas Iscariot betrayed Jesus. Despite its negative connotations, some people embrace the number 13 as a symbol of good luck.