The descendants of one London family are properly entitled to display the following coat-of-arms: "Arms Argent, three cross crosslets between two bendlets gules" with the inscription "Fides et Auber".
Argent means white or silver and gules means red. Bendlets are bands crossing the field (shield) diagonally from top left to lower right. Crosslet means crossed again. Therefore the shield is white (or silver), the crosslets and bendlets are red. Inscritpons begans as battles or shouts of that particular group.
The above came out of Opal London Cox's book The London Family. Everything that I have seen from guys selling it essentially follows the same description.