Electronic Rock duo 3OH!3 used a sign similar to the pyramid sign or roc sign as their logo. It was a perfect fit as the fingers from one hand represented the 3. The thumbs and index’s fingers touch to for a circle representing the “O”, while the other fingers represented the other 3: Three Oh Three. (Note: This isn’t official, I’m just guessing.)

Hang Gesture in 3OH!3’s My First Kiss (The video features Ke$ha, who is quite familiar with Illuminati symbolism)

My First Kiss (2010)

In 2010, Diamond Dallas Page sued 3OH!3 for infringement on his “Diamond Cutter” hand gesture BScopyright.
Band member Nathaniel Motte making the 3 oh 3 sign Image source: Flickr