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  2. Non-integer base of numeration - Wikipedia

    en.wikipedia.org/wiki/Non-integer_base_of_numeration

    This means that the integer part of the natural logarithm of a number in base e counts the number of digits before the separating point in that number, minus one. The base e is the most economical choice of radix β > 1, [ 4 ] where the radix economy is measured as the product of the radix and the length of the string of symbols needed to ...

  3. Radio Data System - Wikipedia

    en.wikipedia.org/wiki/Radio_Data_System

    PI codes are normally static (i.e. do not change). ... Meaning Country Code Program Area Coverage ... Program Item Number 2 0010 Radio Text 3 0011

  4. List of Unicode characters - Wikipedia

    en.wikipedia.org/wiki/List_of_Unicode_characters

    A numeric character reference refers to a character by its Universal Character Set/Unicode code point, and a character entity reference refers to a character by a predefined name. A numeric character reference uses the format &#nnnn; or &#xhhhh; where nnnn is the code point in decimal form, and hhhh is the code point in hexadecimal form.

  5. The digits of pi extend into infinity, and pi is itself an irrational number, meaning it can’t be truly represented by an integer fraction (the one we often learn in school, 22/7, is not very ...

  6. Transcendental number - Wikipedia

    en.wikipedia.org/wiki/Transcendental_number

    In other words, the n th digit of this number is 1 only if n is one of the numbers 1! = 1, 2! = 2, 3! = 6, 4! = 24, etc. Liouville showed that this number belongs to a class of transcendental numbers that can be more closely approximated by rational numbers than can any irrational algebraic number, and this class of numbers is called the ...

  7. Programme identification - Wikipedia

    en.wikipedia.org/wiki/Programme_identification

    The PI code allows the radio to identify the station across different broadcast relay stations. This in turn allows listeners to stay tuned to a network whilst travelling across the service area of multiple transmitters. The PI code is a 4-digit hexadecimal number. For example BBC Radio 1 has PI code C201. (The number itself is usually not ...

  8. Numeric character reference - Wikipedia

    en.wikipedia.org/wiki/Numeric_character_reference

    However, if using tools supporting obsolete implementations of HTML, the reference € (Euro sign in the CP-1252 code page) or ¤ (Euro sign in ISO/IEC 8859-15) may work. As another example, if some text was created originally using the MacRoman character set, the left double quotation mark “ will be

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