The point of intersection of the lateral border of the acromial process and a line running down the middle of the shoulder from the neck to the tip of the shoulder.
Subject is in the anthropometric standing position.
Stand behind the subject and palpate the tips of both shoulders simultaneously. Draw a line along the lateral bony border of each shoulder. Draw a short line along the front edge of the tape where it crosses the acromial border. Repeat the process for the left shoulder. The highest point of the right flexed biceps as viewed from the subject's right side.