thirteen

Thirteen is the natural number that comes after twelve and before fourteen. It is written as 13 in Arabic numerals and XIII in Roman numerals. It is an odd prime number and the sixth prime in the sequence of primes.

In Western culture, thirteen is often regarded as unlucky, giving rise to the term triskaidekaphobia and practices such as omitting the 13th floor from some buildings or avoiding Friday the 13th. In some cultures, such as Italy, thirteen can be interpreted as lucky rather than unlucky.

In religion and myth, thirteen is sometimes linked to gatherings of 13 people at the Last Supper, though interpretations vary.

In media, Thirteen is the title of various works. The 2003 American coming-of-age drama film Thirteen, directed by Catherine Hardwicke, follows two teenage friends. In music, "Thirteen" is a song by Big Star from the 1972 album Radio City, noted for its concise, acoustic style. The term appears in other works as well.