How much money is needed to be a unicorn?

So, I'm curious, what kind of financial threshold does a company need to reach in order to be classified as a unicorn? Is it a specific dollar amount, or is it more of a subjective determination based on a variety of factors? And how does this definition of a unicorn vary from industry to industry? I'm eager to understand the nuances behind this term and how it's applied in the world of cryptocurrency and finance.