Fictional codes are systems of symbols, letters, or numbers created within a story to convey hidden meanings or messages. These codes often enhance the narrative by adding layers of mystery or intrigue, allowing characters to communicate secretly or solve puzzles. Examples can be found in various genres, including mystery novels and fantasy stories. In many cases, fictional codes are designed to be deciphered by the audience, engaging readers or viewers in the plot. They can take the form of ciphers, riddles, or even unique languages, as seen in works like J.R.R. Tolkien's Elvish or Dan Brown's use of codes in The Da Vinci Code.