We have been using letters and symbols practically since the time of cavemen. People scratched symbols on rocks and told a story. A doodle is an unfocused drawing made while a person’s attention is otherwise occupied. Doodles are simple drawings that can have concrete representational meaning or may just be abstract shapes. These scribbling are for fun, and most of the time they have instant drama.
Doodling works best when your mind starts to wander. Many people frown on doodling and consider it a waste of time. But it is a fairly normal way of expressing whats going inside. Doodles are found in school notebooks, often in the margins, drawn when the person is daydreaming or losing interest during class.