Protective sign
symbols to be used during an armed conflict to mark persons and objects under the protection of various treaties of international humanitarian law / From Wikipedia, the free encyclopedia
International law defines a number of signs that can be used during an armed conflict. These signs are known as protective signs. Attacking someone who is clearly showing one of the signs is a war crime. Their meaning usually is "don't shoot", or "don't attack". Depending on the sign used, there is also a more specific meaning.
The form, shape and color of these signs are defined by the rules of international humanitarian law. Usually, they are easy to draw in order to make even an improvised use as easy as possible. They were designed to be easily recognizable as well.