@fabienmarry 2-20P is the frontal view of the plug, ie with the prongs pointing out towards you, and 2-20R is what the outlet looks like. So, yes, it seems you’ll have to rotate the prongs away from you towards the outlet AND then turn it upside down to fit.

Other versions of the chart seemingly have it correct. E.g.:

@mikaeleiman @caseyliss Most folks here will come across a few variants:

110-120V:
The regular 2 prong plug on many devices. Reversible.
The regular 2 prong plug on some devices, not reversible (one prong wider than the other).
The regular 3 prong plug (i.e. with a ground).
(Virtually all residential outlets, at least in recent decades, accept all 3 the above plugs).

220-240V:
Their tumble dryer's plug, which might be one of a handful of different ones, but once plugged in you kinda never think about it again.
Their EV 'charger' (I use 'charger' as is commonly used, even though the wall unit is just a fancy-ish-but-dumb switch, and the charger itself is actually inside the EV).
And possibly an RV (travel trailer i.e. 'caravan', motorhome, etc) cable, which, again, might be one of about 3 different ones.

So, more than other places, but not nearly as plentiful in common use as is on that chart.

@caseyliss Handy chart I always refer to (google "NEMA outlet chart"). Since I have an RV (NEMA 14-50), a (B)EV (also 14-50), a tumbledryer (14-30), and a homemade 240V outlet box with British outlets to use with tools I brought from the UK (that fits both 14-30 and 14-50 -- yes, SUPER up to code, lol).