tabulator

noun

1. A person who counts or tabulates things.
2. The mechanism on a typewriter that sets the position of columns and borders.
3. A tab character.

   “You can put a tabulator in all those places where a space is allowed. A tabulator character corresponds to, for example, 4 spaces in the program editor.”

4. (historical)An early data processing machine that produces printed lists and totals from data on punched cards.