In my experience, ferrite beads generally aren't marked. Sometimes inductors will be, especially when larger, in that same coding patter (similar to what resistors and capacitors are marked with), but I don't think I've seen a ferrite bead that was marked. They're generally rated for an impedance (in ohms, but not at DC) at a specified frequency, so if there was a marking on it, it would either be some kind of manufacturer specific code or that.