[just another ref]

I have never seen the carry signal associated with a travel. If the player catches the ball and travels with it, it's traveling. Carrying is not a violation. It's pretty much just a pantomime showing what the dribbler did to create an illegal dribble violation. The signal, by the book, is really a little subtle action where the emphasis should be on turning over the palm. This is also basically the same signal as an over and back violation. But some officials turn the carry signal into a giant windmill action involving a full rotation with the arm extended. This serves to fuel the myth that any dribble above what is perceived as a "normal" height must be a violation.