Tip for remembering it: N stands for Near.
NPN transistor, the arrow Not Point Near.
PNP transistor? Point Near, Please!
Ok, here's your challenge. Invent something like this for MOSFETs, based upon the direction
of the diode in the middle of the symbol, :-).
I also seem to recall they used to originally show NPN transistors as analogous to 2
anode-to-anode diodes [opposite for PNP], with the base lead coming out the middle,
although that hardly explains how they amplify. It does however explain why you can
take an ohm-meter and determine the type of transistor you have without knowing its