The term "Fn" can refer to various concepts depending on the context. In mathematics, "Fn" often denotes a sequence of numbers, such as the Fibonacci sequence, where each number is the sum of the two preceding ones. This sequence is commonly represented as F0, F1, F2, ... and has applications in computer science, nature, and art. In technology, "Fn" typically refers to a function key found on keyboards, especially on laptops. This key allows users to access secondary functions of other keys, such as adjusting volume or screen brightness. The Fn key enhances productivity by providing quick access to these features without needing to navigate through menus.