A self-serve coffee vessel is an URN, which is a container used to hold hot beverages such as coffee. It is typically made of metal and has a spigot at the bottom for easy pouring. The term 'self-serve' refers to the fact that the user can fill their own cup with the beverage without assistance from a barista or other staff member. This type of vessel is often found in cafeterias, restaurants, and other establishments where customers can quickly and easily get their own coffee.