fyi, User Terminal or UT is quite an established term. Oldest random Googlable example comes to my mind is a thin client server process named "SUNWut"(a ticker code + "ut") from early 2000s. I'm pretty sure the usage traces back multiple decades from that point in phone and software industries.
General usage stemmed from the Tactical User Terminal's deployed in the 1980s by the U.S. Army in Germany; part of codename TENCAP ELINT programme - and were truck-sized!
