Palindromic describes something that reads the same backward as forward. The word “racecar” is palindromic because it spells the same thing whether you read it from left to right or right to left: r-a-c-e-c-a-r. Other palindromic words include “mom,” “kayak,” and “noon.”

Entire sentences can be palindromic too, like “A man, a plan, a canal: Panama!” When you read it backward, letter by letter (ignoring punctuation and spaces), you get the same sequence.

Numbers can be palindromic as well. The year 2002 was palindromic, and the next palindromic year will be 2112. Some people enjoy searching for palindromic sequences in math, creating palindromic poems, or even building palindromic puzzles. DNA sequences in genetics can be palindromic too, which matters in understanding how genes work.

The challenge of creating good palindromes is that you have to work within tight constraints: every letter you add to the beginning must match one at the end. When you discover a palindrome in the wild or create one yourself, there's something satisfying about that perfect symmetry, like finding a butterfly with identical wings.