And that's exactly what it is: a RF Power Combiner simply combines (sum) different signals in a single output. In the above case, the signals are transmitted over port B and C go out through that output (A).
The body mass index (BMI) or Quetelet index is a value derived from the mass (weight) and height of an individual. The BMI is defined as the body mass divided by the square of the body height, and is universally expressed in units of kg/m 2, resulting from mass in kilograms and height in metres.
BMI stands for body mass index. The normal range is considered to be between 18.5 and 24.9. A BMI below this range indicates that a person is underweight; a BMI above 24.9 means that a person is overweight. A. BMI above 30 indicates obesity.