Semiotics is a word that describes the study of signs and how a language without words can provide a message to those who view such
things in environments where they are necessary, such as;
construction, vehicle accidents, alternate road routes and criminal investigations.
The purpose of signs can vary, however.
Their main purpose is to deliver a message to the viewer
that describes the situation of a location or an action
being done which also signifies what the next course of action
the viewer should take.