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2. Numeric keypad - Wikipedia

   en.wikipedia.org/wiki/Numeric_keypad

   The arrangement of digits on numeric keypads with the 7-8-9 keys two rows above the 1-2-3 keys is derived from calculators and cash registers. It is notably different from the layout of telephone Touch-Tone keypads which have the 1 - 2 - 3 keys on top and 7 - 8 - 9 keys on the third row.

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. 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 ...

5. 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 ...

6. 1U - Wikipedia

   en.wikipedia.org/wiki/1U

   RS-1U, a type of K-5 (missile) J-1U, a model of Auster Workmaster; SSH 1U (WA); see Washington State Route 503; An abbreviation for 1 Utama; An abbreviation for "One Union" or "One Big Union", a concept and slogan used by industrial unionists, including the IWW. #1U is used also as a hashtag on social media by labor activists and organizations.

7. 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.

8. Key signature names and translations - Wikipedia

   en.wikipedia.org/wiki/Key_signature_names_and...

   When a musical key or key signature is referred to in a language other than English, that language may use the usual notation used in English (namely the letters A to G, along with translations of the words sharp, flat, major and minor in that language): languages which use the English system include Irish, Welsh, Hindi, Japanese (based on katakana in iroha order), Korean (based on hangul in ...

9. 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 ...