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2. Narcissistic number - Wikipedia

   en.wikipedia.org/wiki/Narcissistic_number

   In number theory, a narcissistic number [1] [2] (also known as a pluperfect digital invariant (PPDI), [3] an Armstrong number [4] (after Michael F. Armstrong) [5] or a plus perfect number) [6] in a given number base is a number that is the sum of its own digits each raised to the power of the number of digits.

3. Mnemonic peg system - Wikipedia

   en.wikipedia.org/wiki/Mnemonic_peg_system

   It associates all numbers 00-99 with a distinctive person, action and object. Any six-digit number can be memorized by using the person assigned the first two digits, the action of the next two digits and the object of the third. [3] For example: The number 34 could be Frank Sinatra. 13 could be the action of kicking. 79 could be a cape.

4. Alphanumeric grid - Wikipedia

   en.wikipedia.org/wiki/Alphanumeric_grid

   An alphanumeric grid (also known as atlas grid [1]) is a simple coordinate system on a grid in which each cell is identified by a combination of a letter and a number. [2]An advantage over numeric coordinates such as easting and northing, which use two numbers instead of a number and a letter to refer to a grid cell, is that there can be no confusion over which coordinate refers to which ...

5. Mnemonic major system - Wikipedia

   en.wikipedia.org/wiki/Mnemonic_major_system

   Numzi - free web application for converting numbers to words/phrases and vice versa using the Major System. Covers the English language with over 220,000 words. Numzi also has an iOS app which is a portable Major System number-word converter. 2Know is free Windows software for converting numbers to words (English, German, French).

6. Dominic system - Wikipedia

   en.wikipedia.org/wiki/Dominic_system

   The main difference between the Dominic system and the major system is the assignment of sounds and letters to digits. The Dominic system is a letter-based abbreviation system where the letters comprise the initials of someone's name, while the major system is typically used as a phonetic-based consonant system for either objects, animals, persons, or even words.

7. Bulls and cows - Wikipedia

   en.wikipedia.org/wiki/Bulls_and_Cows

   For example, if the secret word is heat, a guess of coin would result in "0 bulls, 0 cows" (none of the guessed letters are present); a guess of eats would result in "0 bulls, 3 cows" (since E, A, and T are all present, but in the wrong positions from the guess), and a guess of teal would result in "2 bulls, 1 cow" (since E and A are in the ...