1º_ In the theory of mathematical categories it is a concept that unites the meaning, the essence of different categorical products of different areas. 2º_ It is the result of a manufacturing method that takes advantage of the same raw materials and resources to make two different products. 3º_ "Cloaca, straight, channel through which the feces circulate" . From the Greek 954; 959; 960; 961; 959; 962; ( kopros "excrement") and the Latin ductus , us ( "channel , pipe" ) . 128513;
