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  2. E series of preferred numbers - Wikipedia

    en.wikipedia.org/wiki/E_series_of_preferred_numbers

    Electronic color codecolor-code used to indicate the values of axial electronic components, such as resistors, capacitors, inductors, diodes (also see IEC 60062). Geometric progression; Preferred number; Renard series – used for current rating of electric fuses

  3. Printer tracking dots - Wikipedia

    en.wikipedia.org/wiki/Printer_tracking_dots

    Yellow dots on white paper, produced by color laser printer (enlarged, dot diameter about 0.1 mm) Printer tracking dots, also known as printer steganography, DocuColor tracking dots, yellow dots, secret dots, or a machine identification code (MIC), is a digital watermark which many color laser printers and copiers produce on every printed page that identifies the specific device that was used ...

  4. 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

  5. English Wikipedia - Wikipedia

    en.wikipedia.org/wiki/English_Wikipedia

    In 2007, in preparation for producing a print version, the English Wikipedia introduced an assessment scale of the quality of articles. [42] Articles are rated by WikiProjects. The range of quality classes begins with "Stub" (very short pages), followed by "Start", "C" and "B" (in increasing order of quality).

  6. RGB color model - Wikipedia

    en.wikipedia.org/wiki/RGB_color_model

    A dye filters out all colors but its own; two blended dyes filter out all colors but the common color component between them, e.g. green as the common component between yellow and cyan, red as the common component between magenta and yellow, and blue-violet as the common component between magenta and cyan.

  7. Pinwheel calculator - Wikipedia

    en.wikipedia.org/wiki/Pinwheel_calculator

    A pinwheel calculator is a class of mechanical calculator described as early as 1685, and popular in the 19th and 20th century, calculating via wheels whose number of teeth were adjustable. These wheels, also called pinwheels, could be set by using a side lever which could expose anywhere from 0 to 9 teeth, and therefore when coupled to a ...

  8. Color code - Wikipedia

    en.wikipedia.org/wiki/Color_code

    The earliest examples of color codes in use are for long-distance communication by use of flags, as in semaphore communication. [1] The United Kingdom adopted a color code scheme for such communication wherein red signified danger and white signified safety, with other colors having similar assignments of meaning.

  9. Hexadecimal - Wikipedia

    en.wikipedia.org/wiki/Hexadecimal

    In most current use cases, the letters A–F or a–f represent the values 10–15, while the numerals 0–9 are used to represent their decimal values.. There is no universal convention to use lowercase or uppercase, so each is prevalent or preferred in particular environments by community standards or convention; even mixed case is used.