Palindromes are achiral words, such as:

• nun
• madam
• pop

Or achiral phrases (once spaces and punctuation are removed, by convention) such as these famous examples:

• Nurses, run!
• Madam, I'm Adam!
• A man, a plan, a canal: Panama!

Or achiral sequences, such as a palindromic gene segment:

• GATTATATTAG

Or numbers:

• 123454321

Try this one out...

• 11 x 11 = 121
• 111 x 111 = 12321
• 1,111 x 1,111 = 1234321
• 111,111,111 x 111,111,111=12345678987654321

(...what happens when we get past a nine digit number?)

This is not a palindrome:

((()))

But this is:

((((((

And this is:

(())((

Which makes me:

:( non (:

External references

• Numeric Palindromes