What is rbx in roblox?

Could you elaborate on the significance and function of "rbx" in the context of Roblox? As a cryptocurrency and finance professional, I'm curious to understand how this particular aspect fits into the broader picture of digital currencies and in-game economies. Specifically, what is the role of "rbx" in Roblox? Is it a form of virtual currency? If so, how is it earned, traded, or used within the platform? Additionally, are there any financial implications or considerations for users engaging with "rbx" within Roblox?