An F USB connector, according to some sources, is simply another name for a USB connector, where "F" may refer to "front." However, it is crucial to note that this terminology isn't widely recognized or standardized in the USB specification. The USB Implementers Forum (USB-IF), the organization that develops and maintains USB specifications, doesn't officially define an "F USB" connector.
This means the term could be used informally or within specific contexts, potentially referring to a USB port located on the front panel of a device, such as a desktop computer.
Therefore, while some resources suggest "F USB" signifies a front-mounted USB, it's best practice to rely on standard USB terminology (e.g., USB-A, USB-C, USB 2.0, USB 3.0) for clarity and accuracy. When referring to the location, it is clearer to say "front USB port."
