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  2. Roman numerals - Wikipedia

    en.wikipedia.org/wiki/Roman_numerals

    In tarot, Roman numerals (with zero) are often used to denote the cards of the Major Arcana. In Ireland, Roman numerals were used until the late 1980s to indicate the month on postage Franking. In documents, Roman numerals are sometimes still used to indicate the month to avoid confusion over day/month/year or month/day/year formats.

  3. Names for the number 0 in English - Wikipedia

    en.wikipedia.org/wiki/Names_for_the_number_0_in...

    The letter "o" ("oh") is also used in spoken English as the name of the number 0 when saying times in the 24-hour clock, particularly in English used by both British and American military forces. Thus 16:05 is "sixteen oh five", and 08:30 is "oh eight thirty". [25] The use of O as a number can lead to confusion as in the ABO blood group system ...

  4. Kaktovik numerals - Wikipedia

    en.wikipedia.org/wiki/Kaktovik_numerals

    30,561 10 3,G81 20 ÷ ÷ ÷ 61 10 31 20 = = = 501 10 151 20 30,561 10 ÷ 61 10 = 501 10 3,G81 20 ÷ 31 20 = 151 20 ÷ = (black) The divisor goes into the first two digits of the dividend one time, for a one in the quotient. (red) fits into the next two digits once (if rotated), so the next digit in the quotient is a rotated one (that is, a five). (blue) The last two digits are matched once for ...

  5. Point (typography) - Wikipedia

    en.wikipedia.org/wiki/Point_(typography)

    The point was first established by the Milanese typographer, Francesco Torniella da Novara (c. 1490 – 1589) in his 1517 alphabet, L'Alfabeto.The construction of the alphabet is the first based on logical measurement called "Punto," which corresponds to the ninth part of the height of the letters or the thickness of the principal stroke.

  6. List of file signatures - Wikipedia

    en.wikipedia.org/wiki/List_of_file_signatures

    Hex signature ISO 8859-1 Offset Extension Description 23 21 #! 0 Script or data to be passed to the program following the shebang (#!) [1]: 02 00 5a 57 52 54 00 00 00 00 00 00 00 00 00 00

  7. Dagger (mark) - Wikipedia

    en.wikipedia.org/wiki/Dagger_(mark)

    A dagger, obelisk, or obelus † is a typographical mark that usually indicates a footnote if an asterisk has already been used. [1] The symbol is also used to indicate death (of people) or extinction (of species or languages). [2]

  8. Additive inverse - Wikipedia

    en.wikipedia.org/wiki/Additive_inverse

    In modular arithmetic, the modular additive inverse of x is the number a such that a + x ≡ 0 (mod n) and always exists. For example, the inverse of 3 modulo 11 is 8, as 3 + 8 ≡ 0 (mod 11). [12] In a Boolean ring, which has elements {,} addition is often defined as the symmetric difference.

  9. 30,000 - Wikipedia

    en.wikipedia.org/wiki/30,000

    32043 = smallest number whose square is pandigital. 32045 = can be expressed as a sum of two squares in more ways than any smaller number. [9] 32760 = harmonic divisor number [2] 32761 = 181 2, centered hexagonal number; 32767 = 2 15 − 1, largest positive value for a signed (two's complement) 16-bit integer on a computer.