F64, F-64, f64, or f/64 may refer to: Group f/64, a 1932 group of San Francisco photographers , a 1939 British Royal Navy K-class destroyer Gender identity disorder's ICD-10 code Famicom 64, an alternate name of a Japanese version of Nintendo 64 Double-precision floating-point format, as it's known by its type annotation in Rust. "F64" (song), a 2023 song by Ed Sheeran