f8

F8 is an alphanumeric label that can refer to several unrelated things across different fields. The most common usages are as a keyboard key, a photographic aperture notation with f/8, a stellar spectral subtype, and a model name such as the Ferrari F8 Tributo.

As a keyboard key: The F8 key is the eighth function key on standard keyboards. In Windows boot menus, it historically opened the Advanced Boot Options menu to start Safe Mode; with modern Windows versions this is less reliable due to fast startup, but you can still trigger Safe Mode via Shift+Restart or by using the F11 boot menu on some machines. In software, F8 has specific functions, such as Extend Selection in Microsoft Excel and toggling certain modes in other programs.

As a photographic aperture: In photography, f/8 (read as "f-number eight") denotes an aperture value that controls lens opening size and exposure, with deeper depth of field and relatively sharp images depending on focal length and distance.

As a stellar classification: In astronomy, F8 refers to a subclass within the F-type stars, indicating a yellow-white color and a surface temperature around roughly 6,000–7,500 K. The luminosity class V denotes a main-sequence star.

Model designation: Ferrari F8 Tributo is a mid-engine sports car produced since 2019, named to honor Ferrari's V8 engines and lineage, succeeding the 488 GTB.