1) Computer key 
Tab key (abbreviation of tabulator key or tabular key) on a keyboard is used to advance the cursor to the next tab stop. == History == The word tab derives from the word tabulate, which means `to arrange data in a tabular, or table, form.` When a person wanted to type a table (of numbers or text) on a typewriter, there was a lot of time-consumin.....
[n] - the key on an electric typewriter that causes a tabulation
noun the key on a typewriter or a word processor that causes a tabulation