An ambigram (a term coined by Douglas Hofstadter), is a specially designed word art that can be read in more than one way.
Most ambigrams are eighter symmetrical to the vertical axis or 180° rotation symmetrical (like this submission), but there are also other ways to create ambigrams.
Two of the most famous ambigram artists are Scott Kim and John Langdon. Check out their websites for many great ambigrams!
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Little Maketto Blogshop
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~= Fabeltier Schnabeltier =~
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I have no mouth but I must scream
Hehe, sooner or later I'll surely enter the 3rd dimension
so keep your eye on me.
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~= Fabeltier Schnabeltier =~