Index finger up, middle fingers down, pinky up, thumb in ... credit for making the hand sign synonymous with rock music. When ...

The widely-used hand sign is when the index and pinky fingers stick up while the middle and ring fingers curl down. The thumb can either stick out or curl in on top of the middle and ring fingers.

The “Okay” hand sign now lives in a purgatory of meaning ... the “Okay” hand sign — thumb and forefinger making a ring, other fingers pointed out — is a secret Nazi symbol.

Numerous historians long ago agreed that rock-and-roll emerged from Ike Turner’s “Rocket 88,” but who invented the “rock on” hand gesture so associated with the genre? That’s the hand ...