The greatest advent in rock and roll technology EVER. Four people throw up rock horns and then arange them in a vague rectangular type shape,with connecting pointer and pinky fingers arranged at 90 degree angles.
It is essentially a double ROCKTANGLE
A picture of a correctly performed ROCKTAGON can be seen here
www.deviantart.com/deviation/27531733/
GUY #1: "Dudes this music rocks so much that I'm affraid that regular old rock horns just aren't gonna cut it."
GUY #2 "I know lets throw a ROCKTAGON."
GUYS #1,3,4: "That's a freaking awesome idea."
8π 3π
A cymbal made by Sabian shaped like an octagon, hence the name.
Rocktagons were first created in the 1980s.