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The film guys call it "room tone."
When shooting on location, the mixer for the shoot will often get everyone quiet for a few seconds, and just roll tape on the "quiet" room.
They do this so when the production moves to editing, the "raw room" sound is available "in the clear" for placement in places where the dialog is cut out between lines, etc.
I like to make sure I've got a little "dead roll" of all of the tracks with nothing going on but whatever noise there is from each setup.
It often comes in handy later.
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