What is the term for a small network that may consist of a single computer and mobile device?

A small network that may consist of a single computer and a mobile device is referred to as a Personal Area Network (PAN). This term specifically describes a localized network typically used for personal devices within a close range, often around a few meters. Devices commonly connected in a PAN might include smartphones, tablets, laptops, and other personal electronics that communicate with each other.

The key characteristic of a PAN is its focus on personal usage and the intimate scale of the network, making it ideal for connecting personal devices without the complexity found in larger network types. In contrast, a Local Area Network (LAN) generally covers a broader area, like a home or office, and often accommodates multiple devices beyond a personal scope. A Campus Area Network (CAN) links several buildings within a campus, while a Metropolitan Area Network (MAN) spans a much larger area, such as a city. Thus, the choice of Personal Area Network (PAN) accurately reflects the specific and intimate nature of the network described in the question.