An ambigram is a calligraphic composition of glyphs that can yield different meanings depending on the orientation of observation. Wikipedia

Calligraphic design that has several interpretations as written Wikidata

A design that may be read as the same word, name or phrase (or sometimes two different words, names or phrases) when oriented in two different ways, usually when reflected along a vertical or horizontal axis or when rotated through 180 degrees. Wiktionary

Design that reads as the same word or phrase in two different orientations. Wiktionary (translation)