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

Animation of a half-turn ambigram of the word ambigram, with 180-degree rotational symmetry

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

Sator square (word square and palindrome) with the letters S and N in mirror writing.

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

Rotational ambigram Puzzle / The end by Peter Newell designed in 1893.