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Anonymous
I work with circuit boards. A lot of times, people put icons, logo's or simple drawings on their circuit boards to check recognition marks, as well as to check "readability"
If you have an Xray machine, you could also find funky drawings in the internal layers of the board.
These are there to ensure the integrity of the inner layer. Durring the process of putting the layers together it is possible to sheer an innerconnecting layer, and now your board has shorts and opens.
This is not an uncommon proceedure to put something recognizable on the pcb
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