Tangential relevance is the idea of something being related to a topic in an indirect manner. I feel like Tony Robbins using that term, but it's one that I've really come to love, as it's an idea that can be very useful in searching for quality sites that are relevant to your niche, yet maybe not so relevant as to have been totally plundered by your competitors yet. You've probably read or heard the idea of starting at page 10 of the results of your search,