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  2. List of country calling codes - Wikipedia

    en.wikipedia.org/wiki/List_of_country_calling_codes

    Worldwide distribution of country calling codes. Regions are coloured by first digit. Country calling codes, country dial-in codes, international subscriber dialing (ISD) codes, or most commonly, telephone country codes are telephone number prefixes for reaching telephone subscribers in foreign countries or areas via international telecommunication networks.

  3. RGB color model - Wikipedia

    en.wikipedia.org/wiki/RGB_color_model

    This indirect scheme restricts the number of available colors in an image CLUT—typically 256-cubed (8 bits in three color channels with values of 0–255)—although each color in the RGB24 CLUT table has only 8 bits representing 256 codes for each of the R, G, and B primaries, making 16,777,216 possible colors. However, the advantage is that ...

  4. Ohm's law - Wikipedia

    en.wikipedia.org/wiki/Ohm's_law

    Ohm's law, in the form above, is an extremely useful equation in the field of electrical/electronic engineering because it describes how voltage, current and resistance are interrelated on a "macroscopic" level, that is, commonly, as circuit elements in an electrical circuit.

  5. Lanthanide - Wikipedia

    en.wikipedia.org/wiki/Lanthanide

    The electronic configuration of most neutral gas-phase lanthanide atoms is [Xe]6s 2 4f n, where n is 56 less than the atomic number Z. Exceptions are La, Ce, Gd, and Lu, which have 4f n −1 5d 1 (though even then 4f n is a low-lying excited state for La, Ce, and Gd).

  6. International Bank Account Number - Wikipedia

    en.wikipedia.org/wiki/International_Bank_Account...

    A typical British bank statement header (from a fictitious bank), showing the location of the account's IBAN. The International Bank Account Number (IBAN) is an internationally agreed upon system of identifying bank accounts across national borders to facilitate the communication and processing of cross border transactions with a reduced risk of transcription errors.

  7. List of physics mnemonics - Wikipedia

    en.wikipedia.org/wiki/List_of_physics_mnemonics

    When a variable with an exponent or in a function is covered, the corresponding inverse is applied to the remainder, i.e. = and = ⁡. More Magic Triangle image mnemonics in the style of a cheat-sheet for high-school physics – in the SVG file, hover over a symbol for its meaning and formula.

  8. List of ISO standards - Wikipedia

    en.wikipedia.org/wiki/List_of_ISO_standards

    This is a list of published [note 1] standards and other deliverables of the International Organization for Standardization (ISO). [note 2] For a complete and up-to-date list of all the ISO standards, see the ISO catalogue. [1] The standards are protected by copyright and most of them must be purchased.

  9. Permittivity - Wikipedia

    en.wikipedia.org/wiki/Permittivity

    In the case of solids, the complex dielectric function is intimately connected to band structure. The primary quantity that characterizes the electronic structure of any crystalline material is the probability of photon absorption, which is directly related to the imaginary part of the optical dielectric function ε(ω).