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Tab key
Tab key (abbreviation of tabulator key〔(【引用サイトリンク】title=Underwood Portable Typewriter Gallery )〕 or tabular key〔(【引用サイトリンク】title=Instructions for Using the Underwood Typewriter )〕) 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-consuming and repetitive use of the space bar and backspace key. To simplify this, a horizontal bar was placed in the mechanism with a moveable lever stop for every position across the page, called a tab stop. Initially these were set by hand, but later tab set and tab clear keys were added. When the tab key was depressed, the carriage advanced to the next tab stop. These were set to correspond to the particular column locations of the table, hence tab, being worked on.
The tab mechanism also came into its own as a rapid and consistent way of uniformly indenting the first line of each paragraph, often a first tab stop at 5 or 6 characters was used for this, far larger than the indentation used when typesetting.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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