Down, Set, Hike!

 

http://en.wikipedia.org/wiki/Set

 

http://en.wikipedia.org/wiki/Set_theory

 

 

SET is also the name of a game not to miss.  You can read the rules and give their daily set puzzle a try at http://www.setgame.com/set/puzzle_frame.htm.

 

SET® - the family game of visual perception

 

http://www.setgame.com/