The Wing Chun Compendium by Wayne Belonoha

Wing Chun has a number of striking tools at its disposal, from the most popular and common straight punch, to the less used crane fist. While many of these techniques can be used to strike a specific point, the most common weapon is the phoenix eye fist.

The phoenix fist is created by extending the index finger and bending it at the second knuckle. The rest of the fingers are placed like in a regular fist. Place your thumb into the bend of the second knuckle and squeeze to make the fist tight as a rock. Striking is done with the extended knuckle.