Having been prominently featured in Dan Brown’s bestselling novel, Angels & Demons, Ambigram tattoos became significantly more popular. As an example of a common ambigram, we might consider family-forever, life-death, love-hate, hope-faith, sinner-saint, etc. For example, it can be read upside down or on its own to form a new word.
In typographical terms, an ambigram is a word that can be read differently depending on how it is orientated.