🌐EnglishEnglishDeutschEspañolFrançaisItalianoNederlandsPolskiTiếng ViệtTürkçeРусскийالعربيةفارسی한국어中文日本語EntityQ846324· pop 21· linked from 73 articlesPolybius squareAlso known as Polybius checkerboardtype of cipherAvailable in 21 languagesEspañolFrançaisDeutsch日本語РусскийItalianoالعربيةBulgarianCatalanCzechConnectionsencryptionEntitytap codeEntityCategoriesAncient ArcadiaClassical ciphersHistory of telecommunicationsSteganography