The Ambigram reference article from the English Wikipedia on 24-Jul-2004
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Ambigram

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An ambigram, also known as an inversion, is a graphical figure that spells out a word not only in its form as presented, but also when viewed as a mirror-image, or, in other cases, when rotated through a right angle. The word typically is not a palindrome, although it may be. Also, the word spelled out from the alternate direction may be an altogether different word, although for mirror-images, the canonical form spells out the same word.

Image:ambigram-wiki.png
A mirror-image ambigram for the word "WIKI"

Douglas R. Hofstadter describes an ambigram as a "calligraphic design that manages to squeeze two different readings into the selfsame set of curves". The term was first published by Hofstadter, who attributes it to a friend.

They are exercises in graphic design, playing with optical illusions, symmetry and visual perception. Ambigram lovers value especially those with a relation between form and content.

Ambigrams are sometimes used as logos. Some notable ones include logos for:

Ambigrams feature prominently in Dan Brown's novel, Angels and Demons. The first UK release of the novel featured an ambigram of the title on the cover.

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