What is the full name of USDT?

I am curious about the nomenclature of a particular cryptocurrency. Could you please enlighten me on the full name of USDT? I understand it's a widely traded stablecoin in the crypto world, but I'm not quite sure about its official nomenclature. Your explanation would greatly assist me in gaining a clearer understanding of this financial instrument. Additionally, if you could provide any insights into its working mechanism or how it maintains its stability, it would be greatly appreciated. Thank you for your time and assistance in this matter.