Ambigram
Ambigrams are a particularly complex type of typographical art that can be read identically in different orientations. They typically take the form of a word that reads the same way upside down as it does right side up.
If you rotate either of these below logos 180 degrees, they look exactly the same. It’s a pretty cool and subtle design trick that usually gets noticed mostly by designers, artists and other visually aware folks.
Create your own Ambigram:
You can create your own Ambigram buy using this Ambigram generator:
http://www.flipscript.com/ambigram-generator.aspx
For more details on creating ambigram, you can visit the page:
http://designshack.net/articles/graphics/how-to-design-an-ambigram/
Source: designshack.net