What Do You Call It When Things Can Be Read The Exact Same Upside Down?

Is anyone has ever read Angles & Demons by Dan Brown, the elements as well as the word Illuminati is written in such a way that a word is read the exact same way ride side up or up-side down.
What is that called?
I just remembered because Angels & Demons… which was a good book… is going to be a movie haha

Tags: Amp., Angles, Anyone, call, Dan Brown, Demons", Down, Exact, Illuminati", Read, Same, Things, Upside, way, what, When, Word

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