Draw circuit symbol of Zener diode?

Answer: A Zener diode may be packed in numerous ways. Higher energy loss is employed for some, whereas high voltage forms are employed for the rest. Two tags are located at the end of the bar in the Zener diode circuit symbol, one pointing upwards and another downward.

This is because a process known as Aurora Collapse takes place in the diamond depletion layer when the reverse voltage applied across the Zener diode exceeds the rated voltage of the device, and a current begins to flow through the diode to limit this increase in voltage. 

When this shunt resistance current is reached, it remains relatively constant throughout various reverse voltages, vastly increasing to the circuit’s maximum value (typically limited by a series resistor).