Palindrome

A palindrome is a word, number, phrase, or other sequence of symbols that reads the same backwards as forwards. Examples include “madam”, “racecar”, and the date “22/02/2022”. The term was introduced by English poet and writer Henry Peacham in 1638. Palindromes occur in music, biological structures, and automata theory, where all palindromes over an alphabet form a context-free but non-regular language.

Definition: A sequence that reads the same backwards as forwards
Term introduced: Henry Peacham, 1638
Longest everyday single-word example: saippuakivikauppias, 19 letters

Sources and credits

Article: Palindrome (English Wikipedia)
Wikidata: Q12321
Text: Card text is adapted from the English Wikipedia article by an automated summary. Wikipedia content is available under CC BY-SA 4.0; see the article history for its contributors. CC BY-SA 4.0 · Article history and contributors
Illustration: By Christina Kekka from Athens, Greece Light correction by Basile Morin. CC BY 2.0 · File page on Wikimedia Commons
Christina Kekka from Athens, Greece Light correction by Basile Morin, This file was derived from: Gregory of Nazianzus (4919335562).jpg
Modifications: Resized and converted to WebP
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