Does Lady Gaga have a secret sign?

My little sister adores Lady Gaga, and we were lucky enough to see her in concert at Radio City Music Hall. During the show, Lady Gaga showed her "Little Monsters," aka her fans, a secret sign that symbolizes Gaga fans all over the world. All you have to do is make a claw and growl- the audience growled so loud that the balcony started to rumble! So now my sis and I don't hug hello- we raise our claws!