Space bar

This article is about the typing key. For the video game, see The Space Bar.

The space bar is on the bottom center of the keyboard.

The space bar, spacebar, blank, or space key, is a key on a typewriter or alphanumeric keyboard in the form of a horizontal bar in the lowermost row, significantly wider than all other keys. Its main purpose is to conveniently enter a space, e.g., between words during typing.

History

Originally, (on early writers dating back to the late 19th century) the "bar" was literally a metal bar running across the full width of the keyboard (or even wider, and even surrounding it) that triggered the carriage advance without also firing any of the typebars towards the platen. Later examples gradually shrank and developed into their current more ergonomic form as a wide, centrally located but otherwise apparently normal "key", as typewriter (and computer) keyboards began to incorporate additional function keys and were more deliberately "styled". Although it varies by keyboard type, the space bar usually lies between the Alt key (or Command keys on Macintosh keyboards) and below the letter keys: C, V, B, N and M on a standard QWERTY keyboard. In some keyboards, both physical and specially virtual ones, the U+2423 ␣ OPEN BOX symbol is used to label the space bar.

Some early typewriter and particularly computer keyboards used a different method of inserting spaces, typically a smaller, less distinct "space" key which was also often set in a less central position, e.g. the Hansen Writing Ball, Hammond typewriters or the ZX Spectrum and Jupiter Ace ranges. The earliest known example, Sholes and Glidden typewriter used a lever to provide space between words, placing the invention of the inset space bar after 1843. However these methods were also usually just one part of similarly idiosyncratic full keyboard layouts, designed more to cope with particular technical requirements or limitations than with any sense of user friendliness and as such met with limited success, sometimes being dropped even on later models in the same line (e.g. Sinclair Spectrum 128k and "Plus" lines, which adopted more "normally styled" keyboards with plastic keytops and a wide, central space bar in place of the earlier rubber "chiclet" keys and small, offset space key).

Other uses

Depending on the operating system, the space bar used with a modifier key such as the control key may have functions such as resizing or closing the current window, half-spacing, or even backspacing. On web browsers, the space bar usually allows the user to page down or to page up when the space bar is used with the Shift key.

In many programs for playback of linear media (such as videos or music), the space bar is used for pausing and resuming playback, or for manually advancing through text.

In video games where the playable character can move and jump, the default key to jump is usually the space bar. This is usually used along with the WASD keys for up, down, left and right movement.

References

IBM PC keyboard (Windows, ANSI US layout)
Esc		F1	F2	F3	F4		F5	F6	F7	F8		F9	F10	F11	F12		PrtScn/ SysRq	Scroll Lock	Pause/ Break
<imagemap> File:KB United States-NoAltGr.svg|450px desc none # Row are 60 pixel tall in reference to the unsized original # rect left top right bottom [[link]] # Top row shift rect 0 0 60 30 Tilde rect 60 0 120 30 Exclamation mark rect 120 0 180 30 At sign rect 180 0 240 30 Number sign rect 240 0 300 30 Dollar sign rect 300 0 360 30 Percent sign rect 360 0 420 30 Caret rect 420 0 480 30 Ampersand rect 480 0 540 30 Asterisk rect 540 0 600 30 Parenthesis rect 600 0 660 30 Parenthesis rect 660 0 720 30 Underscore rect 720 0 780 30 Plus sign rect 780 0 900 30 Backspace Top row rect 0 0 60 60 backtick rect 60 0 120 60 1 (number) rect 120 0 180 60 2 (number) rect 180 0 240 60 3 (number) rect 240 0 300 60 4 (number) rect 300 0 360 60 5 (number) rect 360 0 420 60 6 (number) rect 420 0 480 60 7 (number) rect 480 0 540 60 8 (number) rect 540 0 600 60 9 (number) rect 600 0 660 60 0 rect 660 0 720 60 Hyphen-minus rect 720 0 780 60 Equals sign rect 780 0 900 60 Backspace Second row shift rect 0 61 90 90 Tab key rect 90 61 150 90 Q rect 150 61 210 90 W rect 210 61 270 90 E rect 270 61 330 90 R rect 330 61 390 90 T rect 390 61 450 90 Y rect 450 61 510 90 U rect 510 61 570 90 I rect 570 61 630 90 O rect 630 61 690 90 P rect 690 61 750 90 Curly bracket rect 750 61 810 90 Curly bracket rect 810 61 900 90 Vertical bar Second row rect 0 61 90 120 Tab key rect 90 61 150 120 q rect 150 61 210 120 w rect 210 61 270 120 e rect 270 61 330 120 r rect 330 61 390 120 t rect 390 61 450 120 y rect 450 61 510 120 u rect 510 61 570 120 i rect 570 61 630 120 o rect 630 61 690 120 p rect 690 61 750 120 Square bracket rect 750 61 810 120 Square bracket rect 810 61 900 120 Backslash Third row shift rect 0 121 105 150 Caps lock rect 105 121 165 150 A rect 165 121 225 150 S rect 225 121 285 150 D rect 285 121 345 150 F rect 345 121 405 150 G rect 405 121 465 150 H rect 465 121 525 150 J rect 525 121 585 150 K rect 585 121 645 150 L rect 645 121 705 150 Colon (punctuation) rect 705 121 765 150 Quotation mark rect 765 121 900 150 Enter key Third row rect 0 121 105 180 Caps lock rect 105 121 165 180 a rect 165 121 225 180 s rect 225 121 285 180 d rect 285 121 345 180 f rect 345 121 405 180 g rect 405 121 465 180 h rect 465 121 525 180 j rect 525 121 585 180 k rect 585 121 645 180 l rect 645 121 705 180 Semicolon rect 705 121 765 180 Apostrophe rect 765 121 900 180 Enter key Fourth row shift rect 0 181 135 210 Shift key rect 135 181 195 210 Z rect 195 181 255 210 X rect 255 181 315 210 C rect 315 181 375 210 V rect 375 181 435 210 B rect 435 181 495 210 N rect 495 181 555 210 M rect 555 181 615 210 Bracket rect 615 181 675 210 Bracket rect 675 181 735 210 Question mark rect 735 181 900 210 Shift key Fourth row rect 0 181 135 240 Shift key rect 135 181 195 240 z rect 195 181 255 240 x rect 255 181 315 240 c rect 315 181 375 240 v rect 375 181 435 240 b rect 435 181 495 240 n rect 495 181 555 240 m rect 555 181 615 240 Comma (punctuation) rect 615 181 675 240 Full stop rect 675 181 735 240 Slash (punctuation) rect 735 181 900 240 Shift key Bottom row rect 0 241 90 300 Control key rect 90 241 150 300 Windows key rect 150 241 240 300 Alt key rect 240 241 600 300 Space bar rect 600 241 690 300 Alt key rect 690 241 750 300 Windows key rect 750 241 810 300 Menu key rect 810 241 900 300 Control key </imagemap>																	Insert	Home	PgUp		Num Lock	∕	∗	−
																	Delete	End	PgDn		7	8	9	+
																					4	5	6
																		↑			1	2	3	Enter
																	←	↓	→		0    Ins		.  Del