The phrase "occupy wall street" could be signed several different ways. I'll show you how I sign it. If you you come across a way that makes more sense, or if you know of any Deaf people who are directly involved with the actual "occupy wall street" movement who sign it differently, do let me know.
SEIZE = "occupy"
There is a general sign for "wall," that generally refers to a "flat surface" that is "one side" of a room. But I recommend you spell W-A-L-L as in the part of the title "Wall Street" since it isn't referring to a typical "wall."
W-A-L-L
STREET / way / road / path / ...
Sample video: "Occupy Wall Street" (.mp4)
Notes: