The 23 enigma is a belief in the significance of the number 23.[1] The concept of the 23 enigma has been popularized by various books, movies, and conspiracy theories, which suggest that the number 23 appears with unusual frequency in various contexts and may be a symbol of some larger, hidden significance. A topic related to the 23 enigma is eikositriophobia, which is the fear of the number 23.[citation needed]