What is the meaning of USDB?

As a financial and cryptocurrency practitioner, I'm often faced with the task of deciphering various abbreviations and acronyms. Could you perhaps shed some light on the meaning of "USDB"? Is it a new digital currency? A specific financial instrument? Or perhaps a reference to a regulatory body or index? Clarifying its meaning would greatly assist me in my daily work and ensure I'm up to date with the latest developments in the cryptocurrency and finance industries. Your insight would be invaluable in this regard.