UUCP is not a descriptor of any kind of a network in any engineering sense that I know of. It is a point-to-point communications protocol.
You should revise some of the history behind it. It was a descriptor for a very large network, it was even a TLD in the mid eighties when the transition to DNS was taking place, the old bang style addresses like mine original seismo!atina!pete transitioned for a while to pete@atina.UUCP and later to pete@atina.ar. UUCP was not just a point to point protocol. Originally it was a set of utility programs to permit copying files between Unix systems (Unix to Unix CoPy, hence the name), since electronic emails where essentially files UUCP became the transport mechanism for both electronic email and later Usenet News. Some referred to UUCP as Unix to Unix Communications Protocol, not quite right but yes one of the pieces of UUCP (uucico = Unix to Unix Copy in Copy Out) implemented different type of communication protocols negotiated during the initial handshake phase and fine tuned to different communication facilities, point to point, telephone modems, specific modems such as Telebit Trailblazers with PEP, different types of encapsulation using X.28, X25, and obviously TCP/IP. For several years until we've got a more decent telecommunications infrastructure UUCP was all we had in Argentina to let the academic and science community reach out and communicate with their colleagues around the world, we had an adapted version of the UUCP implementation for DOS (some called it UUPC) that became very popular and enabled our "UUCP network" to reach over 800 nodes in the early 90's when we later were able to get a direct (IP) connection to the rest of the world. My .02 Cheers Jorge