(http://www.clker.com/cliparts/9/6/b/5/119543789489042057caduceus_ryland_sanders_01.svg.hi.png)

This symbol stands for the medical profession. It is world wide, and upon viewing this symbol on a map or a sign, one would know where to find a hospital or medical center.

(http://www.clker.com/cliparts/9/5/9/e/1206572559605899892johnny_automatic_NPS_map_pictographs_part_102.svg.med.png)

The same goes for this symbol. The common graphic that represents an airport is easily recognizable and can guide someone to an airport should they need to find one.

(http://www.tldm.org/News10/Hammer3.png)

The communist symbol is another widely recognized graphic. The graphic can stand for revolution, the proletariat, the peasantry, agriculture, or international solidarity. Communist states, parties and movements use these symbols to advance and create solidarity within their cause.