What is the RPL limit?

Excuse me, I'm interested in understanding the intricacies of cryptocurrency and finance, and I've come across the term "RPL limit" in my research. Could you please elaborate on what this limit specifically refers to? Is it a limitation imposed by a particular cryptocurrency protocol, or is it a regulatory cap imposed by financial institutions? What are the factors that influence the RPL limit, and how does it impact the overall cryptocurrency ecosystem? Your insights would be greatly appreciated.