The panhandle grip is where you have the thumb on the side of the racket, pinching the sides with your thumb and fingers in the position shown below.
平底锅握拍法,你会把食指拇指夹在窄棱上
The panhandle grip is the one that actually comes most naturally to beginners because it’s easy to hit overhead shots with – but contrary to what many players use this for, the panhandle grip is used for: