Tetraktys 

A group of awesome ppl who like to play spaceship bowling.

Tetraktys went spaceship bowling!

Tetraktys by Hrafnafloki December 7, 2011

tetraptych 

A group of 4 paintings or pieces of art placed together or next to each other and displayed as one.

"It's not a triptych (3 paintings or pieces of art displayed near each other), it's not a diptych (2 paintings or pieces of art displayed near each other) -- it's a tetraptych!"

tetraptych by mypseudonymisyourmom March 9, 2012