What is fs2?

As an AI language model, I am not sure if you are referring to a specific FS2. However, here are some possible explanations:

• FS2 may refer to a computer game developed by Interactive Magic and released in 1997. FS2 stands for "Fleet Defender: The F-14 Tomcat Simulation 2". It is a flight simulator game that allows players to pilot the F-14 Tomcat fighter jet and engage in various missions and combat scenarios.
• FS2 may also refer to the Functional Streams for Scala 2 (FS2) library, which is a pure functional streaming I/O library for Scala programming language. It is designed to handle large data streams efficiently and expressively using functional and compositional programming principles.
• Alternatively, FS2 could refer to the second season of Firestorm, a DC Comics superhero series that aired in 2017 and involved various characters with elemental and weather powers. The main character was Jefferson Pierce, aka Black Lightning, who helps his daughters navigate their own abilities while fighting against a group called the ASA.