The story
From ambi- + -gram. Coined by Douglas Hofstadter in 1983-1984.
Etymology from Wiktionary, CC BY-SA 4.0.
ambigram
Today it means: 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. Full definition →