Classifiers are very powerful vocabulary and grammatical tools.
A classifier is a handshape that represents a person or object after you have indicated what the person or object is. It can represent the movment, location or appearance of the person or object.
For example, once you sign the word "car" you can use the handshape to represent the vehicle, how it moves and where it is located.
This dictionary focuses on regular signs rather than complex classifiers.