Although the “Jolly Roger” is sometimes referred to as any flag flown by a pirate, it has generally come to represent a picture of a skull and crossbones emblazoned on a black background. It is still used on warning signs ranging from “high voltage” to “land mines”.
The Smiley Face symbol is one of the most widely used symbols today. Either displayed as in the picture above or as an emoticon it has been adopted by email and internet users worldwide to express the emotion of happiness in a simple symbol. Two sources claim to have created the symbol (this is ignoring the millions of children who draw it instinctively every day).