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UTMOST was the results of a substantial 2017 upgrade to MOST, the Molonglo Observatory Synthesis Telescope, a radio telescope located in Hoskinstown, Australia (near Canberra). UTMOST was retired in June 2023. The upgraded telescope's target was radio transients including pulsar observations and fast radio bursts (FRBs). MOST was a c1980 rebuilding of the 1960s Molonglo Cross Telescope. The Molonglo Cross was cross-shaped (with north-south and east-west arms), and MOST reconfigured that into twin 778-meter east-west cylindrical telescopes, 15 meters' separated. The UTMOST upgrade gave it a modern back end. A further upgrade carried out in 2020-2021 was termed UTMOST-2D, which restored its north-south arms, i.e., restored its cross shape. The terms UTMOST-NS and UTMOST-EW refer to UTMOST's arms along the north-south and east-west directions: these operated together for a period of time, but at other times, operation was just one or the other.