Just in case you still want an answer to this, or if someone else is looking here for an answer, I think that number refers to your
basal metabolic rate (BMR).
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The basal metabolic rate (BMR) is the base rate at which your body consumes calories for basic metabolic functions like maintaining internal temperature, repairing cells, pumping blood, powering muscles at rest, etc. In other words, it is the rate at which your body consumes calories when at rest.
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busywomensfitness.com
That might be it, but i'm not sure...