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2. Rack unit - Wikipedia

   en.wikipedia.org/wiki/Rack_unit

   Rack with sample component sizes including an A/V half-rack unit. A rack unit (abbreviated U or RU) is a unit of measure defined as 1 + 3 ⁄ 4 inches (44.45 mm). [1] [2] It is most frequently used as a measurement of the overall height of 19-inch and 23-inch rack frames, as well as the height of equipment that mounts in these frames, whereby the height of the frame or equipment is expressed ...

3. Keycap - Wikipedia

   en.wikipedia.org/wiki/Keycap

   [1] Double shot: The most expensive and durable process: each outer keycap has its legend physically moulded into it, and the legend is then created by injecting a different piece of plastic into the keycap from the inside. This means that there is no chance of the legend ever fading or getting removed, even as the keycap wears down.

4. Numeric keypad - Wikipedia

   en.wikipedia.org/wiki/Numeric_keypad

   Numeric keypads usually operate in two modes. When Num Lock is off, keys 8, 6, 2, and 4 act like arrow/navigation keys up, right, down, and left; and 7, 9, 3, and 1 act like Home, PgUp, PgDn, and End, respectively. With Num Lock on, digit keys produce the corresponding digit.

5. 19-inch rack - Wikipedia

   en.wikipedia.org/wiki/19-inch_rack

   Thus, a 1U rackmount computer is not 1.750 inches (44.5 mm) tall but is 1.719 inches (43.7 mm) tall. If n is number of rack units, the ideal formula for panel height is h = 1.75n − 0.031 for calculating in inches, and h = 44.45n − 0.794 for calculating in millimeters. This gap allows a bit of room above and below an installed piece of ...

6. Keyboard technology - Wikipedia

   en.wikipedia.org/wiki/Keyboard_technology

   Keyboard construction of a typical notebook computer keyboard, in four layers. The technology of computer keyboards includes many elements. Many different keyboard technologies have been developed for consumer demands and optimized for industrial applications.

7. IBM PC keyboard - Wikipedia

   en.wikipedia.org/wiki/IBM_PC_keyboard

   different shaped Return key (spanning 1.5-width D13 and C13) with the U.S. D13 at C12 and single width single-width Backspace key (at E14 ) additional 5 keys: one to the left ( A03 ) of the space bar, two to the right ( A06 and A07 ) of the space bar, one to the left of the Right Shift key ( B11 ), and one to the left of the Backspace key ( E13 ...

8. Keyboard layout - Wikipedia

   en.wikipedia.org/wiki/Keyboard_layout

   A typical 105-key computer keyboard, consisting of sections with different types of keys. A computer keyboard consists of alphanumeric or character keys for typing, modifier keys for altering the functions of other keys, [1] navigation keys for moving the text cursor on the screen, function keys and system command keys—such as Esc and Break—for special actions, and often a numeric keypad ...

9. Chiclet keyboard - Wikipedia

   en.wikipedia.org/wiki/Chiclet_keyboard

   A white standard wired chiclet keyboard (flat keyboard) A chiclet keyboard is a computer keyboard with keys that form an array of small, flat rectangular or lozenge-shaped rubber or plastic keys that look like erasers or "Chiclets", a brand of chewing gum manufactured in the shape of small squares with rounded corners.