What are NEMA 6-20 250V receptacles used for?

[oil pan 4]

I recently moved into a home that has several of these outlets in various places throughout. After a bit of googling, they appear to be NEMA 6-20 250 volt receptacles. In my 52 years, I haven't ever owned anything that plugs into this type of receptacle. Do you all have any of these outlets in your place, and what do you plug into them?
View attachment 290585

I plug my Nissan leaf charger into one.

 

[Astro14]

Table saw
Jointer
Dust collector

Mine all run on 240 volts.