Certain signs can reverse their orientation to express the opposite of what the original sign meant.
For example: the sign WANT:
Can be changed into DON'T-WANT by doing the sign "WANT" then
reversing the movement (and the orientation of the hands).
Some of the other signs that use reversal of orientation for negation include:
can reverse the orientation of LIKE
to mean DON'T-LIKE
can reverse the orientation of KNOW
to mean DON'T-KNOW
(If you think of or see other signs that use this principal--let me know.)
Some signs that cannot use reversal of orientation:
cannot reverse "HAVE"
cannot reverse "HAPPY"
cannot reverse "WASH"
