What is a super unicorn company?

Could you please elaborate on the concept of a 'super unicorn' company? I've heard the term used frequently in the tech and finance world, but I'm not entirely clear on what defines a company as such. Are there specific criteria or milestones that need to be achieved? How does the valuation of a super unicorn differ from that of a regular unicorn? Additionally, could you provide some examples of well-known super unicorn companies?