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  2. Letter frequency - Wikipedia

    en.wikipedia.org/wiki/Letter_frequency

    The California Job Case was a compartmentalized box for printing in the 19th century, sizes corresponding to the commonality of letters. The frequency of letters in text has been studied for use in cryptanalysis, and frequency analysis in particular, dating back to the Arab mathematician al-Kindi (c. 801–873 AD), who formally developed the method (the ciphers breakable by this technique go ...

  3. Percentage - Wikipedia

    en.wikipedia.org/wiki/Percentage

    To calculate a percentage of a percentage, convert both percentages to fractions of 100, or to decimals, and multiply them. For example, 50% of 40% is: ⁠ 50 / 100 ⁠ × ⁠ 40 / 100 ⁠ = 0.50 × 0.40 = 0.20 = ⁠ 20 / 100 ⁠ = 20%. It is not correct to divide by 100 and use the percent sign at the same time; it would literally imply ...

  4. English alphabet - Wikipedia

    en.wikipedia.org/wiki/English_alphabet

    The word alphabet is a compound of alpha and beta, the names of the first two letters in the Greek alphabet. Old English was first written down using the Latin alphabet during the 7th century. During the centuries that followed, various letters entered or fell out of use.

  5. Plus–minus sign - Wikipedia

    en.wikipedia.org/wiki/Plus–minus_sign

    When the standard presumption that the plus-or-minus signs all take on the same value of +1 or all −1 is not true, then the line of text that immediately follows the equation must contain a brief description of the actual connection, if any, most often of the form "where the ‘±’ signs are independent" or similar.

  6. Alphabet (formal languages) - Wikipedia

    en.wikipedia.org/wiki/Alphabet_(formal_languages)

    For example, the alphabet of lowercase letters "a" through "z" can be used to form English words like "iceberg" while the alphabet of both upper and lower case letters can also be used to form proper names like "Wikipedia". A common alphabet is {0,1}, the binary alphabet, and a "00101111" is an example of a binary string.

  7. Times New Roman - Wikipedia

    en.wikipedia.org/wiki/Times_New_Roman

    In the mid-1960s, a derivative of Times New Roman known as 'Press Roman' was used as a font for the IBM Composer. [161] This was an ultra-premium electric 'golfball' typewriter system, intended to be used for producing high-quality office documents or copy to be photographically enlarged for small-scale printing projects. [161]

  8. Zipf's law - Wikipedia

    en.wikipedia.org/wiki/Zipf's_law

    The actual rank-frequency plot of a natural language text deviates in some extent from the ideal Zipf distribution, especially at the two ends of the range. The deviations may depend on the language, on the topic of the text, on the author, on whether the text was translated from another language, and on the spelling rules used.

  9. Alphabet book - Wikipedia

    en.wikipedia.org/wiki/Alphabet_book

    An alphabet book is a type of children's book giving basic instruction in an alphabet. Intended for young children, alphabet books commonly use pictures, simple language and alliteration to aid language learning. Alphabet books are published in several languages, and some distinguish the capitals and lower case letters in a given alphabet.