T-elos is a battle gynoid similar to KOS-MOS but unknown to most of Vector Industries. Her designs were featured in a U-TIC ship in Episode I; however, details on it are currently unknown. Note that telos is a Greek word meaning purpose, or goal; the final end of a process. This seems to tie in with her rumored function and eventual task of destroying KOS-MOS.
T-elos only appears in Episode III, however there is a board in Episode I which when inspected states "It is marked "T-ELOS." It seems to be a part for some sort of robot." She will also appear as a crossover character in the upcoming role-playing game Super Robot Taisen OG Saga Endless Frontier as a villain, alongside KOS-MOS with an unresolved conflict between the 2 androids.