Why dont many hotels have a 13th floor?

Many hotels and buildings in several different countries, especially Western countries, do not have a 13th floor because of _triskaidekaphobia_, the fear of the number thirteen. Triskaidekaphobia is a well-known superstition, and many people avoid the number thirteen because it is often associated with bad luck and misfortune.

In some countries, such as the United States, Italy, and Spain, the number 13 is considered unlucky. This is because it follows 12, which is considered a perfect number. In Roman culture, XIII can also be represented as "IIIIX," which is read as nine minus one. Additionally, the Last Supper had thirteen attendees, and Judas, the betrayer, was the 13th guest.

To appease superstitious guests and potential buyers, many hotels and buildings omit the 13th floor. Some buildings will use floor numbering such as 13A, 14, 13M, or 12B to avoid the number thirteen altogether.