A lot of the ones I use are what loebtmc described above and came from the "Schneider Notation System" ...but only the ones that make sense to me and I can remember off the top of my head: give, take, above, below, stand/sit/lay, and a lot of the body parts are the first ones that come to mind.
I also found I wanted quick symbols for "to" "enter" and "exit," so I invented:
- to (as in Actor x - L of SR bench)
< enter
> exit
I circle all people (a one- or two-letter initial for each) and box/square all furniture/set pieces. BN= bench, CH= chair, BD= bed, X=platform.
You can see the Schneider system here, about 3/4 of the way through the document: newbielink:http://www.hofstra.edu/pdf/dd_sm-hndbk.pdf [nonactive]
EDIT: page 129, to be precise. CTRL-F is your friend. - PSMKay