What is what does fn mean?

"FN" can stand for various things depending on the context. Here are a few possibilities:

1. FN can be an abbreviation for the word "function." In computing, this may refer to a specific command or action that a program or device performs.

2. FN can also be a shorthand way of referring to the company Fabrique Nationale d'Herstal, a Belgian firearms manufacturer known for producing a wide range of guns for military, law enforcement, and civilian use.

3. In some contexts, such as online gaming, "FN" may be short for "Fortnite," a popular video game.

4. In some medical contexts, "FN" may be an abbreviation for "false negative," which refers to a test result that incorrectly indicates that a condition or disease is absent.

5. "FN" could also be a person's initials or a nickname.