An unburned area between a finger and the main body of the fire, and a dangerous place for fire fighters, is called a(n):

The term "pocket" refers to an unburned area situated between a finger of fire and the main body of the fire. This area can pose significant risks for firefighters because it can serve as a potential trap. Firefighters might inadvertently enter this space, thinking they are safe, when in fact, the fire could easily spread or become more aggressive if the conditions change. Understanding these types of fire behavior is crucial for maintaining safety and effectively executing firefighting tactics.

Other terms, though they might describe different fire situations, do not accurately encapsulate the concept of an unburned area positioned in this specific way, which is why "pocket" is the most appropriate term in this context.