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  2. National conventions for writing telephone numbers - Wikipedia

    https://en.wikipedia.org/wiki/National_conventions_for...

    Landline numbers in Taiwan are written with the area code in parentheses [with phone numbers total nine digits] Example: (02) XXXX YYYY for phone numbers in Taipei area. Mobile phones have 3 digit "company code" assigned to different mobile service carriers such as (09**) XXXXXX followed by a 6 digit phone number.

  3. Telephone numbers in Ghana - Wikipedia

    https://en.wikipedia.org/wiki/Telephone_numbers_in_Ghana

    The Ghana telephone numbering plan is the system used for assigning telephone numbers in Ghana. It is regulated by the National Communications Authority, which holds responsibility for telecommunications . Since 1 May 2010, all fixed-line numbers and mobile numbers have 9 national (significant) numbers after the '0' trunk code. [1]

  4. Number sign - Wikipedia

    https://en.wikipedia.org/wiki/Number_sign

    The symbol # is known variously in English-speaking regions as the number sign, hash, or pound sign. The symbol has historically been used for a wide range of purposes including the designation of an ordinal number and as a ligatured abbreviation for pounds avoirdupois – having been derived from the now-rare ℔ .

  5. Reynolds number - Wikipedia

    https://en.wikipedia.org/wiki/Reynolds_number

    Definition. The Reynolds number is the ratio of inertial forces to viscous forces within a fluid that is subjected to relative internal movement due to different fluid velocities. A region where these forces change behavior is known as a boundary layer, such as the bounding surface in the interior of a pipe.

  6. Plus and minus signs - Wikipedia

    https://en.wikipedia.org/wiki/Plus_and_minus_signs

    When placed after a number, a plus sign can indicate an open range of numbers. For example, "18+" is commonly used as shorthand for "ages 18 and up". In US grading systems, the plus sign indicates a grade one level higher and the minus sign a grade lower. For example, B− ("B minus") is one grade lower than B.

  7. Telephone numbers in Mexico - Wikipedia

    https://en.wikipedia.org/wiki/Telephone_numbers_in_Mexico

    Country code. 52. Telephone numbers in Mexico are regulated by the Federal Telecommunications Institute, an independent government agency of Mexico. The agency published the Fundamental Technical Plan for Numbering ( Plan Técnico Fundamental de Numeración) on May 11, 2013. [1] The plan establishes a uniform ten-digit telephone number format.

  8. Mobile phone - Wikipedia

    https://en.wikipedia.org/wiki/Mobile_phone

    A mobile phone (or cellphone [a]) is a portable telephone that can make and receive calls over a radio frequency link while the user is moving within a telephone service area, as opposed to a fixed-location phone ( landline phone ). The radio frequency link establishes a connection to the switching systems of a mobile phone operator, which ...

  9. Telephone numbers in Serbia - Wikipedia

    https://en.wikipedia.org/wiki/Telephone_numbers_in_Serbia

    The country calling code of Serbia is +381. The country has an open telephone numbering plan, with most numbers consisting of a 2- or 3-digit calling code and a 6-7 digits of customer number.