The "Back of the place sign" indicates that you are approaching an area such as a town or a city. It is used to mark the end of a regulated area, typically where certain local traffic rules might have been in effect, such as speed limits or parking regulations. When you see this sign, it means you can resume standard traffic regulations applicable to roads outside of that area. Make sure to lower your speed if you were adhering to slower limits in the area you just exited. If you have more questions about driving in Germany or traffic regulations, feel free to ask!