When I looked at this image, I immediately thought of other symbols that guide or instruct. Of these symbols, I thought of were:

(http://portabletrafficsignalstss.com/TSSst0p/wp-content/uploads/2010/07/crosswalk-signals.gif)

The common cross walk symbols are seen every day. They are simplistic, and by using both color and identifiable shapes, someone who wants to cross the street is informed of when a safe time to cross would be.

(http://grogansbluff.net/grogansbluff/upld_files/hoa0001/f1000154_neighborhoodwatch.gif)

This image has a couple benefits. It is the neighborhood watch symbol, and it both instructs thieves away, as well as providing security for ones home.

(http://www.brickfactory.info/scans/06000/6597/010.jpg)

Though the graphic is not as simple, and is more of a literal direction, legos use the same principle for the design of their construction manual. There are no words, but simply the pictures of how to assemble the blocks and what order to put them together in.