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  2. Alphabetic numeral system - Wikipedia

    en.wikipedia.org/wiki/Alphabetic_numeral_system

    An alphabetic numeral system employs the letters of a script in the specific order of the alphabet in order to express numerals. In Greek, letters are assigned to respective numbers in the following sets: 1 through 9, 10 through 90, 100 through 900, and so on. Decimal places are represented by a single symbol.

  3. Number - Wikipedia

    en.wikipedia.org/wiki/Number

    Here the letter Z comes from German Zahl 'number'. ... Each hypercomplex number system is a subset of the next hypercomplex number system of double dimensions ...

  4. Roman numerals - Wikipedia

    en.wikipedia.org/wiki/Roman_numerals

    The "Number Forms" block of the Unicode computer character set standard has a number of Roman numeral symbols in the range of code points from U+2160 to U+2188. [78] This range includes both upper- and lowercase numerals, as well as pre-combined characters for numbers up to 12 (Ⅻ or XII ).

  5. Gematria - Wikipedia

    en.wikipedia.org/wiki/Gematria

    Within each group, the first letter is replaced by the last, the second by the 10th, etc. Ayak bakar replaces each letter by another one that has a 10-times-greater value. The final letters usually signify the numbers from 500 to 900. Thousands is reduced to ones (1,000 becomes 1, 2,000 becomes 2, etc.) Ofanim replaces each letter by the last ...

  6. Caesar cipher - Wikipedia

    en.wikipedia.org/wiki/Caesar_cipher

    Caesar cipher. The action of a Caesar cipher is to replace each plaintext letter with a different one a fixed number of places down the alphabet. The cipher illustrated here uses a left shift of 3, so that (for example) each occurrence of E in the plaintext becomes B in the ciphertext. In cryptography, a Caesar cipher, also known as Caesar's ...

  7. English alphabet - Wikipedia

    en.wikipedia.org/wiki/English_alphabet

    Modern English is written with a Latin-script alphabet consisting of 26 letters, with each having both uppercase and lowercase forms. 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.

  8. Numerical digit - Wikipedia

    en.wikipedia.org/wiki/Numerical_digit

    Each digit in a number system represents an integer. For example, in decimal the digit "1" represents the integer one, and in the hexadecimal system, the letter "A" represents the number ten. A positional number system has one unique digit for each integer from zero up to, but not including, the radix of the number system.

  9. List of numeral systems - Wikipedia

    en.wikipedia.org/wiki/List_of_numeral_systems

    This is the minimum number of characters needed to encode a 32 bit number into 5 printable characters in a process similar to MIME-64 encoding, since 85 5 is only slightly bigger than 2 32. Such method is 6.7% more efficient than MIME-64 which encodes a 24 bit number into 4 printable characters. 89