[bmicraft]

The side with the holes. That's true for 95% of devices, with one of the few major exceptions being cheap chinese powerbanks

[wlesieutre]

Or if you’re plugging into a desktop where the ports are vertical

[bmicraft]

There is usually still a concept of front. Most desktops if laid down would be laying on their right side (so the motherboard & cpu aren't upside down). From there you can still pretty easily tell how the port is oriented without looking.

[saagarjha]

Which requires being able to see the plug.

[YeahThisIsMe]

As with most plugs that came before it.

[1718627440]

Also the side that has the logo on.