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The four general parameters or characteristics of a sign are:
4. Orientation (palm orientation)
A fifth parameter that is often added to this list is
5. "Facial Expressions" and/or "Non-manual
Note if you are taking a test and are asked, "What are the four characteristics or parameters of a sign?" Answer: handshape, location, movement, and palm orientation.
If you are asked "What are the five characteristics or parameters of a sign?" Then add "facial expressions" to your answer.