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.
Origin
1980s. From ambi- + -gram.
Definition of ambigram in US English:
ambigram
nounˈambɪɡram
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.