Palindromes

A palindrome is a word, phrase, number, or any other sequence of characters that reads the same forwards and backwards (ignoring spaces, punctuation, and capitalization). Examples of palindromic words include "racecar" and "level." Palindromic phrases could include "A man, a plan, a canal, Panama!" or "Madam, in Eden, I'm Adam." In numbers, an example of a palindrome is 12321.