"Clarity of purpose, large markets, rich customers, focus, pain killers, think differently, team DNA, agility, frugality... "
The list comes from Sequoia Capital. Author Laura Papworth cites the source document in the post. It makes for good reading, concise but very rich. Here's a link:
I skipped one element because it doesn't fit well into a quick list and deserves more emphasis. The source post called it "inferno." That's hard to get with a single word, but the explanation is worth emphasizing:
"Start with only a little money. It forces discipline and focus. A huge market with customers yearning for a product developed by great engineers requires very little firepower."
For the record, this same post also includes a very nice set of suggestions for a concentrated business plan, with the main elements that should be covered. I don't know what the blogging protocol is for that but I'm about to post it as a second item, so it gets separate treatment.