What Electronic Component Marking On A Circuit Board Is Designated For BF?
The image you present doesn't present enough information but I highly believe it is a ferrite bead.

My reasoning:


The symbol being BF1 seems like short for Bead Ferrite 1
The texture of the component looks awfully like a Ferrite core, but inverted, thus a ferrite bead.


https://en.m.wikipedia.org/wiki/Ferrite_bead