Why electronics components have secret codes? Like LM7805 for Volt Regulator. I am new in electronics and I want to create some circuit designs in softwares like Circuitmaker, Multisim, Qucs or Proteus. I do understand the symbols of components and simple names like diode or resister but I am not able to understand how a simple diode gets a complex name like 1N5349B ?? Is there anyway to understand to read this (1N5349B) and figure out that if its a diode or a transformer or a resistor??