B-Factor
B & M is bodies and machines. When there are way more people than space or machines, you got a high B & M factor.
I got stuck in a subway car with 100 people. That was a 100 B & M factor.
The mall on Black Friday had a 500 B & M factor. I almost got trampled.
My office got a 200 B & M factor. There was no space between the desks.