Do Not Enter Sign in front of a house.
The abstract 'No Entry' sign was officially adopted to standardization at the League of Nations convention in Geneva in 1931. The sign was adapted from Swiss usage. The Swiss, in turn, adopted the practice of former European states that marked their boundaries with their formal shields and, when not wishing visitors to enter, would indicate so by tying a blood-red ribbon horizontally around the shield.
The European 'No Entry' sign was adopted into North American uniform signage in the 1970s, replacing its rectangular, white Do Not Enter sign, although the U.S. version retains the wording Do Not Enter where the European and Canadian version typically has no wording on it.