Polybius square
nounEtymology From Polybius + square (“grid”). It was invented by the Ancient Greek historian and scholar Polybius.
Communications, Electrical engineering, Engineering, Natural sciences, Physical sciences, 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.
Computing, Cryptography, Engineering, Mathematics, Natural sciences, Physical sciences, Sciences A grid used for fractionating plaintext characters so that they can be represented by a smaller set of symbols.
- Coordinate terms
- semaphore, Morse code