Polybius square

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Polybius +‎ square (grid). From being a square grid used to encode characters invented by the Ancient Greek historian and scholar Polybius.


Polybius square (plural Polybius squares)

  1. (telecommunications, historical) A character code represented by two sets of six lit torches, used to send messages character by character, in a two point visual fire telegraph. The character code is generated by encoding characters in a grid, where each character generates two numbers, uniquely representing each character as a pair of numbers.
  2. (cryptography) A grid used for fractionating plaintext characters so that they can be represented by a smaller set of symbols.

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