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The Umyfymu was an Orion T-class destroyer in service during the 2270s decade.
In the year 2275, the Umyfymu attempted to lure the Federation starship USS Enterprise into a trap. When that failed, the ship chased the Enterprise and eventually engaged it in combat. The Enterprise was victorious and the Umyfymu was forced to retreat to Orion space. (TOS novel: Death Count)