What does the "I" stand for in BMI?

I am a 5"9 almost 5"10 female and my doctor says I should weigh no more than 150 pounds. That on me looks like skin and bone, I refuse!

according to bmi, we should all be anorexic

I just guessed that from what I already know.

Pennyenn, I completely understand you. I think that the BMI is nonsense