Spanish sign language?

A few weeks ago Aaron and I were at the mall. I was looking for new shoes (always the never ending task) and he was walking around the different shoe displays. He walked up to me with his hands crossed in front of his chest and his fingers were fluttering.

Lynn "Aaron, whatcha doin'?"

Aaron: "Sign language, mom!" (followed by a look I can only classify as "DUH!")

L: "I see! What sign are you making?"

A: "It's Spanish! For flower!"

Well silly me. And here I thought there was only one kind of sign language.