The ear twist is so called because it's the one you use for teddy bears and other animals ears. It is also called the pinch twist. The pinch twist is a very handy twist to know and is also good for positioning balloons and controlling angles between twists. Although it is a useful twist try not to use too many as this can cause the appearence of model to become cluttered.

Basically what you are doing for a pinch twist is twisting one bubble between it's two twists to create a tight bubble 'wedge'. Squeeze with one hand and grab the bubble with the other and twist it..See pictures below: