There are logotypes that you have probably looked at, but didn't realize if you rotate one in 180º degrees that it still spells the same word. That was the case with "Oysho." I've been to their store many times, however, never realized their logo was an ambigram.
Top: "Filly" by/© BarbaRoja.
"DeLorean Motor Company" by/© DMC.
"Edoga" by/© Arnas Goldbergas (a.k.a. Matto).
"Anouk" © Anouk. Designer unknown.
"Cheap" by/© Peter Orban.
"Philosophy" by/© John Langdon.
"Kasey" by/© Bilebo.
"Oysho" by/© Inditex Group.