S. is a unique manuscript created in the early 16th century, known for its mysterious content and intricate illustrations. It features an unknown language and a variety of botanical, astronomical, and biological drawings, which have puzzled scholars and cryptographers for years. The manuscript is named after the letter "S" found on its cover. The manuscript is housed at Yale University and has been the subject of extensive research and speculation. Many theories exist regarding its origin, purpose, and the identity of its author, but no definitive answers have been found. The allure of S. continues to captivate those interested in historical texts and cryptography.