Words like "racecar," "level," and "noon" are called palindromes. A palindrome is a word, phrase, or sentence that reads the same backward as forward. Palindromes can be found in many languages and can be made up of letters, numbers, or symbols. Some examples of palindromic words include "civic," "rotor," "deified," and "reviver". The longest single-word palindrome in everyday use is the Finnish word "saippuakivikauppias," which means "a soapstone vendor" and has 19 letters.