How much is one flow?

Could you possibly elaborate on the phrase "How much is one flow?"? I'm not entirely clear on the context in which it's being used. Is "flow" referring to a specific type of currency, perhaps in the realm of cryptocurrency? Or does it have a different meaning within the realm of finance? Additionally, how is the value of "one flow" determined? Is it based on market conditions, supply and demand, or some other factor? Could you provide more clarity on this matter? Thank you for your assistance in clarifying this inquiry.