The unicorn may as well be the new Silicon Valley mascot.
The term, reserved for the rare start-up that reaches a $1 billion valuation, is being thrown around in mainstream media and casual conversation because of the speed at which companies are reaching the milestone.
But it's not just about getting there. CB Insights, a New York-based research firm, released data on Friday showing that the private companies worth the most are multiplying their valuations at a ridiculous clip.
Doubling in value in a year is hard, and should get more challenging as the numbers get larger. Not in this market.