![]() ![]() Historical development Ī Sator square (in SATOR-form), on a wall in the medieval fortress town of Oppède-le-Vieux, France crab-like) to refer to letter-by-letter reversible writing. It is derived from the Greek roots πάλιν 'again' and δρóμος 'way, direction' a different word is used in Greek, καρκινικός 'carcinic' (lit. The word palindrome was introduced by English poet and writer Henry Peacham in 1638. In automata theory, the set of all palindromes over an alphabet is a context-free language, but it is not regular. Palindrome are also found in music (the table canon and crab canon) and biological structures (most genomes include palindromic gene sequences). The concept of a palindrome can be dated to the 3rd-century BCE, although no examples survive the first physical examples can be dated to the 1st-century CE with the Latin acrostic word square, the Sator Square (contains both word and sentence palindromes), and the 4th-century Greek Byzantine sentence palindrome nipson anomemata me monan opsin. The 19-letter Finnish word saippuakivikauppias (a soapstone vendor), is the longest single-word palindrome in everyday use, while the 12-letter term tattarrattat (from James Joyce in Ulysses) is the longest in English. The 4th-century Greek palindrome: ΝΙΨΟΝ ΑΝΟΜΗΜΑΤΑ ΜΗ ΜΟΝΑΝ ΟΨΙΝ ( Wash your sins, not only your face), at the Hagia Sophia in Constantinople.Ī palindrome is a word, number, phrase, or other sequence of symbols that reads the same backwards as forwards, such as madam or racecar, the date and time 12/21/33 12:21, and the sentence: "A man, a plan, a canal – Panama".
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