https://electronics.stackexchange.com/questions/155985/why-do-the-2n2222-and-pn2222-avalanche-differently
The letter is always 'N', and the first digit is 1 for diodes, 2 for transistors, 3 for four-leaded devices, and so forth. Metal-can package can be PN2222A.
After that, it's garbage. The letters or numbers I mean.
https://www.elexp.com/Images/Reading_Transistor_Markings.pdf
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