Palindrome

A palindrome is a word, sentence, or number that reads the same from left to right as from right to left.^[1]^[2] Punctuation does not matter, but letters and digits do. All alphabetic languages have palindromes. The first palindrome was the Latin Sator Square, which reads:

You can read it horizontally, backwards, even vertically!

Examples of Palindromes

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v t e Hidden messages
Main	Subliminal message
Audio	Backmasking list Hidden track list pregap list Phonetic reversal Reverse speech
Numeric	Numerology Cryptology Chronogram Theomatics Bible code
Visual	Fnord Pareidolia Hidden text Paranoiac-critical method Psychorama Sacred geometry Steganography Visual cryptography
Other	Apophenia Cryptic crossword Anagram Palindrome Unconscious mind Asemic writing Clustering illusion Easter egg Observer-expectancy effect Pattern recognition Simulacrum Synchronicity