Tango has a rich history in Argentina. This dance has been danced in Buenos Aires for many years. There are established rules of conduct, for most of the accepted practices in tango. The cabeceo being the most know, but there are rules for conduct, line of dance and cleanlinesss. These rules are called códigos.
A friend recently sent this link with this charming video on the códigos. And as tango, has started up again, not quite 45 Milongas in a day but many, thought we all could use a refresher. Disfrutas