The definition of B/F is as an accounting term meaning brought forward from a previous page or column.(abbreviation)
An example of B/F is the amount at the top of a column being the same as the amount at the bottom of the same column on the previous page.
The definition of bf is as an abbreviation for boldface or best friend.(abbreviation)
An example of bf is a heavy dark printing type.
See bf in Webster's New World College Dictionary
See bf in American Heritage Dictionary 4