what is ATX 12V?

[zulu9812]

So, I was shopping for power supplies and I came across lots of ATX 12V PSUs. Now, I've never heard of an ATX 12V before. As far as I know, my PSU is just straightforward ATX. Can anyone enlighten me?

 

[Gainy]

Took me 30 seconds to find on google

http://www.formfactors.org/developer\specs\ATX_ATX12V_PS_1_1.pdf

Go to section 1.2