I bought the book, ALTERED FATES, by Jeff Lyon and Peter Gorner. On page 416, there's a reference to riflip mapping. I hadn't encountered this term before and thus went to the internet and did a search. ZERO matches. I can't find a reference to this term anywhere except this book. I'm curious. What's a riflip? Is this a term that's fallen from usage or never even made it into usage?