Pin where you have been, where you want to go or mark your sales territory on a map! Map tacks are small specialized pins that come in 3 sizes with a small round head, or shaped like a pennant or rectangle. They stand out from the map or document you are marking (as opposed to a dot or sticker which is flat) and don't cover up what is beneath. There are a variety of colors to choose from. There are also pins with numbers if you need them to correspond to an index or list.