Hi Randy, thanks for explaining about the socket. Now, my only question
is why the pins in eagle are in a line. Aren't the pins usually arranged
in a quare format, is this a US/Europe difference issue?

> RA = right angle, so the connector would come in parallel to the PCB.
> This kind of connector is used on basically everything. With a
> vertical connector, the USB plug would be perpendicular to the PCB.
> 
> Single refers to the fact that there's only one USB receptacle, and 4
> pole = 4 pins.
> 
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