What is a Unicorn Company? Definition or Meaning

Unicorns refer to companies that have been valued at over a billion dollars. Male entrepreneurs who are in touch with their childhood self may frown at unicorns, why not name it wizards or after a superhero instead?

For example…

Xiaomi, a Chinese mobile phone startup hit the unicorn status almost immediately. As of 2016, it is now an unicorn several times over. Starting off offering an Android smartphone, Xiaomi has also diversified into providing smart rice cookers.