tab key

noun
a key on a typewriter, computer terminal, or other keyboard, that is pressed in order to indent what will be typed next to a predetermined position.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
If one accidentally presses the tab key, as one often does when indenting a new
  paragraph, the text gets put into a preview box.
The tab key sent a physical roller holding the paper zipping to the left until
  it crashed into a tab stop.
Pressing the tab key repeatedly will cycle through the the control bar.
Navigate through the form using the tab key or by placing your mouse cursor in
  the appropriate area you wish to fill in.
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