Daniel's ambigram
An AMBIGRAM is a calligraphic design that has more than one interpretation as written.
The term was coined by Douglas Hofstadter in 1983.
Ambigrams appear as visually symmetrical words and when flipped, they remain unchanged, or they mutate to reveal another meaning.
"Half-turn" ambigrams undergo a point reflection (180° rotational symmetry) and can be read upside down, mirror ambigrams have an axial symmetry and can be read through a reflective surface (like a mirror or a mirroring lake), and many other types of ambigrams exist.