There's a specific word which is used for drawings(like smilies,cars,cartoons,etc) which we made for timepass, say while talking with someone or in lecture!! I need to know the exact word for it.

There's a specific word which is used for drawings  (like smilies, cars, cartoons, etc) which we made to pass the time, say while talking with someone or in a lecture. I need to know the exact word for it.