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1st_ 'TN' stands for newscasts or news strings for names such as "Telenoticias" or "All News". 2nd_ 'TN' in Argentina is a reference to the category of automotive competition of "National Tourism". 3rd_ 'TN' is another way to abbreviate "TeNo" for Technische Nothilfe ( "Technical Emergency Help", German organization). 4th_ 'tn' is an unofficial symbol for tonne, but it appears in some texts. See t . 5th_ ' . tn' is the internet domain for Tunisia.