A Balloon Is a Circle Placed on the Drawing with a Part

A balloon is a circle placed on the drawing with a part identification number inside the circle. While part identification on an exploded technical illustration commonly use circles with numbers inside as balloons, some companies prefer to use numbers without circles. Each balloon is connected to its related part with a leader line. The balloon part identification number correlates to the same number identifying the part in the parts list. The parts list identifies every part in the assembly.