Ambigram (n.): also sometimes known as an inversion, is a graphical figure that spells out a word not only in its form as presented, but also in another direction or orientation. The text can also consist of a few words, and the the text spelled out in the other direction or orientation is often the same, but can also be a different text.
In definition, that's how you say an ambigram is, me found this ambigram while reading Dan Brown's Angels And Demons. And guess what? the ambigram displayed at the book was exactly the four elements:
and since it represents all the four tattoos that me wanted so much, they're also going to be the part me me tattoos... :)