BF
Abbreviation for 'black female' used by doctors as shorthand when jotting down the results of their physical examination.
For example, a WDWNBF = well developed, well nourished black female; WDWNWF = well developed, well nourished white female; WDWNWM = well developed, well nourished white male; WDWNBM = well developed, well nourished black male; etc.