F9

F9 is a designation used in several different contexts, including computing, film, aerospace, genetics, and astronomy. The meaning depends on the domain, and there is no single definition associated with F9.

In entertainment, F9 refers to the ninth film in the Fast & Furious franchise, titled F9: The Fast Saga. Released in 2021 and directed by Justin Lin, the film follows Dom Toretto and his family as they confront a threat linked to his past.

In aerospace, F9 is used as an informal shorthand for SpaceX's Falcon 9 rocket. The Falcon 9 is a two-stage orbital launch vehicle designed to deliver payloads to space and has been used for satellites, cargo resupply missions, and crewed flights.

In genetics, F9 is the standard gene symbol for coagulation factor IX, a protein essential to blood clotting. Mutations in F9 can cause hemophilia B, a bleeding disorder.

In astronomy, F9 denotes a late subclass of F-type stars in the stellar classification system. F-type stars are white to yellow-white and hotter than the Sun; the F9 subclass is toward the cooler end of the F range.