An ambigram, also sometimes known as an inversion, is a graphical figure that spells out one or more words not only in its form as presented, but also in another direction or orientation. The text spelled out in the other direction or orientation is often the same, but can also be a different text (source: Wikipedia).

Below we selected some ambigrams in logo design:

Anouk (2009)

Sun Microsystems (1982)

New Man (1969)

Angels & Demons

Blacksmith

Bombay Stock Exchange

De Lorean Motor Company

GOES

Illuminati