Found in the following dictionaries
OTCWL2014 (NASPA Word List 2014)
"Ambigram" Definition
noun
A design that may be read as the same word or phrase (or sometimes two different words or phrases) when oriented in two different ways, usually when reflected in a vertical axis or when rotated through 180 degrees.
Source: Wiktionary
A typographical design consisting of text modified in such a way that it can be read in multiple orientations, as in mirror image, inverted, or when rotated.
Source: Oxford Dictionary
A typographical design consisting of text modified in such a way that it can be read in multiple orientations, as in mirror image, inverted, or when rotated.
Source: Oxford Dictionary
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