carriage return
noun
°On a mechanical typewriter the action or result that comes about using the return lever which when moved caused the paper holding carriage to return to it's home (left margin position) and advance the line advance roller by single-space, double-space or one-and-a-half-spaced lines down the page being typed.
°On a electric typewriter or electronic (computer) printer the key, key press, or control code which causes the carriage or print-head to return to its home (left margin position) and advance the roller similarly, or the description of taking the action giving that result.