A Guhor Stick is a tool used by
radio traffic analysts to draw a traffic network or other
node-based interactive diagram. It is a transparent
acrylic straightedge roughly six inches long with three or four differently-sized round and square cutouts in it.
The larger holes are used to draw the command nodes and the smaller holes are used to draw in the subordinate nodes. The square holes are usually used when it is needed to add textual data such as callsigns to the node designation.
Although it is a vaguely Russian-sounding word, I looked it up in a (online) Russian-English dictionary without result. This could be from the stick getting a Russian name that originally made sense but was twisted by American tongues over time.