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  2. QR code - Wikipedia

    en.wikipedia.org/wiki/QR_Code

    The QR code system was invented in 1994, at the Denso Wave automotive products company, in Japan. [5] [6] [7] The initial alternating-square design presented by the team of researchers, headed by Masahiro Hara, was influenced by the black counters and the white counters played on a Go board; [8] the pattern of position detection was found and determined by applying the least-used ratio (1:1:3 ...

  3. Form I-129 - Wikipedia

    en.wikipedia.org/wiki/Form_I-129

    The key difference between Forms I-140 and I-129 is that they are for immigrant and non-immigrant visas respectively. Form I-765 is the application form for non-immigrant workers to receive an Employment Authorization Document (EAD). Unlike the forms above, it is not a petition but an application made directly by the person seeking the EAD.

  4. Resin identification code - Wikipedia

    en.wikipedia.org/wiki/Resin_identification_code

    Resin code for polyethylene terephthalate Polypropylene lid of a Tic Tac box, with a living hinge and the resin identification code, 5, under its flap. The ASTM International Resin Identification Coding System, often abbreviated RIC, is a set of symbols appearing on plastic products that identify the plastic resin out of which the product is ...

  5. Tetris - Wikipedia

    en.wikipedia.org/wiki/Tetris

    Tetris is primarily composed of a field of play in which pieces of different geometric forms, called "tetrominoes", descend from the top of the field. [2] During this descent, the player can move the pieces laterally and rotate them until they touch the bottom of the field or land on a piece that had been placed before it. [3]

  6. Handkerchief code - Wikipedia

    en.wikipedia.org/wiki/Handkerchief_code

    The handkerchief code (also known as the hanky code, the bandana code, and flagging) [1] is a system of color-coded cloth handkerchief or bandanas for non-verbally communicating one's interests in sexual activities and fetishes. The color of the handkerchief identifies a particular activity, and the pocket it is worn in (left or right ...

  7. RGB color model - Wikipedia

    en.wikipedia.org/wiki/RGB_color_model

    When one of the components has the strongest intensity, the color is a hue near this primary color (red-ish, green-ish, or blue-ish), and when two components have the same strongest intensity, then the color is a hue of a secondary color (a shade of cyan, magenta or yellow). A secondary color is formed by the sum of two primary colors of equal ...

  8. Electrical tape - Wikipedia

    en.wikipedia.org/wiki/Electrical_tape

    Electrical Tape Color Codes [2] Tape color Usage (U.S.) Usage (U.K.) Usage (International – new) Black Insulation Low voltage, phase A Insulation Low voltage, phase C Low voltage, phase B Red Low voltage, phase B Low voltage, phase A Sheath, 415 V 3 phase Blue Low voltage, phase C Low voltage, phase C Low voltage, neutral Sheath, 230 V Brown

  9. Electric potential - Wikipedia

    en.wikipedia.org/wiki/Electric_potential

    Electric potential (also called the electric field potential, potential drop, the electrostatic potential) is defined as the amount of work/energy needed per unit of electric charge to move the charge from a reference point to a specific point in an electric field.