Phrase guide

Polybius square

noun · 2 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

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1

noun

Meaning 1

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.

Definition source: English Wiktionary via Wiktextract

Usage: historical

Topics: communications, electrical-engineering, engineering, natural-sciences, physical-sciences, telecommunications

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

A grid used for fractionating plaintext characters so that they can be represented by a smaller set of symbols.

Definition source: English Wiktionary via Wiktextract

Topics: computing, cryptography, engineering, mathematics, natural-sciences, physical-sciences, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

History

Etymology

From Polybius + square (“grid”). It was invented by the Ancient Greek historian and scholar Polybius.