I should have killed that image.
The one on bitmain looks like it could be a c19
I have a long listing here :
https://internationalconfig.com/icc6.asp?item=57011
still can't find a 25 amp plug
home page
https://internationalconfig.com/wwpts/index.asp
this is a very large catalog. can't find the plug.
found a 20amp 250 volt
https://www.internationalconfig.com/documents/57090-M.pdf
but this miner can do 277 volts so may need a 277 volt socket/plug
here is all I got on 277 volt cables
https://www.kordking.com/277-volt-power-cords/
found a nema 7 on amazon
I think its because its probably an in house solution and a step up towards 3 phase.
I imagine they couldn't find anything rated right for $20 or less so they just made one. (probably saved a lot of $ doing it too)
Bitcoin Miner S19 XP Hydro took the waterproof connectors NotFuzzyWarm shared.
these look like a step below that but a bit above a c19 as a c19's max is rated 250V and 20 Amps