No its not gang symbols. Its the greater than / less than symbols - hand gesture. I show my students this when teaching AutoCAD to get them into the thinking of using and thinking of these symbols because in AutoCAD in the command line they represent the default value or last value used. Which means you can save time by not having to do additional typing versus just hitting the enter key to accept whats in the "<>" value. So we can save additional time by using the default or previous used value by reading the command line with the greater than and less than symbols "<>". Remember the graphic and save your self some time!