What is the QRL code?

Excuse me, could you please elaborate on what the QRL code is? I'm not entirely familiar with the term and would appreciate a concise explanation. Is it a specific type of code used in the cryptocurrency or finance industry? If so, what are its main features and purposes? Additionally, how does it differ from other similar codes or systems in the field? I'm eager to learn more about this topic and how it might impact the industry.