A graph heading is a title or label that is placed at the top of a graph. The two crossword solutions for the term graph heading are TELE, which stands for Teletype, and MIMEO, which stands for Mimeograph. Teletype was an electromechanical device used to send and receive typed messages over a communication line. It was widely used in the 20th century for telegraphy and teleprinter operations. Mimeograph was a duplicating machine that used a stencil through which ink was pressed onto paper. It was commonly used in the early 20th century for printing documents.