It's called a palindrome. A string of letters that when read from end to beginning is the same as forwards.
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Mister MicawberMy favorite:A man, a plan, a canal—Panama!Really, the situation was much more complicated than that:
khoffA man, a plan, a cat, a ham, a yak, a yam, a hat, a canal -- Panama!Fun, but I prefer the simple elegance of the original.