White Out vs Sector White Out
Yes, Sector White Out is the more widely accepted term. I'm prone (for the sake of brevity) to use the term "whiteout" with the knowledge that my colleagues are aware of the double entendre and that I'm meaning no ground definition but 100km visibility. Yes, not the best approach on this inter web thingy though.
I was recently told a great story about some of the guys exploring in the Southern PCMs back in the 50's mistaking a sleddog turd on a nearby snowdrift for a distant mountain range on a cloudy dat. It had them fooled for a while.