fan

n. Without qualification, indicates a fan of science fiction, especially one
who goes to con s and tends to hang out with other fans. Many hackers are
fans, so this term has been imported from fannish slang; however, unlike
much fannish slang it is recognized by most non-fannish hackers. Among SF
fans the plural is correctly fen , but this usage is not automatic to
hackers. Laura reads the stuff occasionally but isn't really a fan.