Virtually any discussion of palindromes - regardless of the source - reveals a complete lack of interest in small words. In particular, one will rarely encounter a list of one-letter palindromes, presumably because that type of word should be palindromic by any definition. While this is clearly the case for the most common, garden-variety examples (e.g. A, I, O etc.) the naive view will have us believe that one-letter words with an adjacent apostrophe -typically contracted words in English - should be palindromes as well.
"Not All One-letter Words Are Palindromes,"
Word Ways: Vol. 44
, Article 13.
Available at: https://digitalcommons.butler.edu/wordways/vol44/iss4/13