What is Quench

I got started on the old TRW "TURBO" pistons for the SBC with the D shaped cup
Milled D Cups in the 6 pack pistons to same shape with the closed chamber heads
On the Quench domes- were they not some of the ones that shrouded the spark plugs on BBC, Cleveland etc
I remember cutting fire slots on some but can't verify the name
also lots of those back then did not have the deck high enough requiring more than usual bloc decking
Bitched at KB about this at first