Using the reference is very simple. All you need to do is move your mouse over the symbol you want information about and click. Note that when you move your mouse over any symbol, an explaination of what is appears below the graphic. To move between the different catagories, just click the approiate link under "Catagories", or use the "Next" and "Previous" links to surf through the various catagories. Remember that there are a few variations in the way different people draw their symbols. For example, some use earth ground and circuit ground to mean the same thing. This reference tries to provide the industry standard symbols...