What is "ambigrams"

Usage examples of "ambigrams".

John Langdon, who rose brilliantly to my impossible challenge and created the ambigrams for this novel.

To one of the most ingenious and gifted artists alive, John Langdon, who rose brilliantly to my impossible challenge and created the ambigrams for this novel.

And although ambigrams were common in symbology-swastikas, yin yang, Jewish stars, simple crosses-the idea that a word could be crafted into an ambigram seemed utterly impossible.