Identify different classes of classifiers
Body part classifier (BPCL) is a symbol that refers to a part of the body beyond the frame of signing area -- e.g. legs, back, feet, etc. For example, you utter the ASL word #foot and then use its classifier (e.g. the passive hand) to represent the foot. For a brain or a heart, you use the classifier in the mid-air space. Plural classifier (PCL)