Rule #1: There are no rules.

USB Form-Factor

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Whomever designed the physical shape of the USB (type a) connector clearly was not thinking.

You don’t make a plug which is symmetrical but yet can only be inserted one way. Half the time you try to plug a USB device in, you end of flipping it over because you had it backwards. Actually more than half the time since the plugs can be hard to slide in, so you think you have it backwards. In that case you end up flipping it at least twice.

Don’t people consider these things?