Bain Marie is also known as a double broiler is used to cook foods such as custards, melting chocolates, some gravies, and other delicate dishes such as mousses.
Definition: A bain Marie is a utensil and a cooking technique. One container with food to be cooked is placed in another, larger pan containing water that is at the simmering point. This method of cooking surrounds the food with very gentle heat and is used for cooking delicate dishes like custards or white sauces, or melting chocolates
The bain Marie method of cooking is cooking in a water bath. You can slow cook using this method. This method is used in order to slowly cook items. It is used when you do not want to raise the temperature too much or too quickly.
Because creme brûlée needs slow cooking, so the egg yolks on the creme brûlée dont get overcooked, bain marie guarantees that the temperature around the ramekins doesn't raise above 100C, because that's the temperature when water boils, water never gets its temperature above that level. Also, bain marie guarantees an even temperature which is desirable for such a delicate dessert.
Seeing as this is in Food and Cooking, I'll assume you really mean 'bain Marie'. This is a large double cooking pot, or a pot on top of a slightly larger one, used to boil vegetables.
A Bain Marie is a "water bath" method of cooking. It is used to surround the actual cooking container (like a small ceramic ramekin) with an inch or so of warm water in the oven to cook items gently and thoroughly. Typically custards are cooked in this method as the eggs need this gentle heat to remain tender and not tough.
The staining technique used to identify simple stains is called the simple staining technique.
Rhetorical device
Marie Curie used an invention called the electron.She also used a method that separated different elements in a substance made of 30 minerals called blende to find radium.
ropes....from the rope-a-dope technique he used
They used a technique called "lockout"
The technique that Remembrnt used is called the "light and shadow technique." It is why his art is mostly known for.
The technique used in music where notes are played smoothly and connected, indicated by a curved line called a dotted slur is called legato.