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A fire will have the following parts to help clarify each area of the fire. Air units often use these terminologies since they can see the fire from an aerial point of view. The Head of the fire is the most active portion of the fire and shows where the direction of the fire is heading. This is also where the most active attack on the fire takes place. The heel is the complete opposite end of the head. There is usually very little fire activity here since the wind is not pushing the fire into unburnt areas. The origin of the fire is usually near the heel. A finger is a small area of the fire that is protruding from the main part of the fire. Sometimes a finger is an old head before the winds shifted and the head went elsewhere. The green is anything that is unburned outside of the fire.