Semiconductor diodes - Electronic symblos

To diference each type of diode we use symbols. There are alternate symbols for some types of diodes, though the differences are minor.

        => Diode                  =>Light Emiting Diode (LED)
         => Photodiode           => Schottky Diode
          => Transient Voltage => Tunnel Diode
                                            Suppression (TVS)

       => Varicap                 => Zener Diode