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  2. List of vacuum tubes - Wikipedia

    en.wikipedia.org/wiki/List_of_vacuum_tubes

    Later special-quality tubes had not base and function swapped but were assigned a 4-digit number, [3] such as ECC2000 or ED8000, the first digit of which again denoting the base: 1 – Miscellaneous 2 – 10-pin Decal base ( JEDEC E10-61)

  3. List of postal codes - Wikipedia

    en.wikipedia.org/wiki/List_of_postal_codes

    A lower first digit indicates a place in south (for example 00100 Helsinki), a higher indicates a place further to north (99800 in Ivalo). The last digit is usually 0, except for postal codes for PO Box number ranges, in which case it is 1. Country code for Finland: "FI". In Åland, the postal code is prefixed with "AX", not "FI". Some postal ...

  4. List of numeral systems - Wikipedia

    en.wikipedia.org/wiki/List_of_numeral_systems

    A base-11 number system was attributed to the Māori (New Zealand) in the 19th century [32] and the Pangwa in the 20th century. [33] Briefly proposed during the French Revolution to settle a dispute between those proposing a shift to duodecimal and those who were content with decimal. Used as a check digit in ISBN for 10-digit ISBNs ...

  5. Personal identification number - Wikipedia

    en.wikipedia.org/wiki/Personal_identification_number

    Personal identification number. A personal identification number (PIN), PIN code, or sometimes redundantly a PIN number, is a numeric (sometimes alpha-numeric) passcode used in the process of authenticating a user accessing a system. The PIN has been the key to facilitating the private data exchange between different data-processing centers in ...

  6. Numeral system - Wikipedia

    en.wikipedia.org/wiki/Numeral_system

    In base 10, ten different digits 0, ..., 9 are used and the position of a digit is used to signify the power of ten that the digit is to be multiplied with, as in 304 = 3×100 + 0×10 + 4×1 or more precisely 3×10 2 + 0×10 1 + 4×10 0. Zero, which is not needed in the other systems, is of crucial importance here, in order to be able to "skip ...

  7. Ethernet over twisted pair - Wikipedia

    en.wikipedia.org/wiki/Ethernet_over_twisted_pair

    Since common Category 5 cable has four pairs, it is possible to use the spare pairs (pins 4–5, 7–8) in 10- and 100-Mbit/s configurations for other purposes. The spare pairs may be used for power over Ethernet (PoE), for two plain old telephone service (POTS) lines, or for a second 10BASE-T or 100BASE-TX connection.

  8. Quaternary numeral system - Wikipedia

    en.wikipedia.org/wiki/Quaternary_numeral_system

    v. t. e. Quaternary / kwəˈtɜːrnəri / is a numeral system with four as its base. It uses the digits 0, 1, 2, and 3 to represent any real number. Conversion from binary is straightforward. Four is the largest number within the subitizing range and one of two numbers that is both a square and a highly composite number (the other being thirty ...

  9. Seven-segment display - Wikipedia

    en.wikipedia.org/wiki/Seven-segment_display

    Seven-segment display. A typical 7-segment LED display component, with decimal point in a wide DIP -10 package. A seven-segment display is a form of electronic display device for displaying decimal numerals that is an alternative to the more complex dot matrix displays. Seven-segment displays are widely used in digital clocks, electronic meters ...