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Symbols - Transistor

NPN
It is made of combination of P-type semiconductor between two N-type semiconductors. It is switched ON when the base-emitter junction is forward biased. They are commonly used for amplifying and switching applications.
PNP
It is made of combination of N-type semiconductor between two P-type semiconductors. It is switched ON when the base-emitter junction is reverse biased. These are used for amplifying and switching applications.