Bioinformatics, Protein Engineering, Biochemistry.
This stands for B-factor. However, when the b-factor is 0.00 it doesn’t mean it’s 0, it means we don’t know about the b-factor of this atom. B-factor is a number larger than 0.00 and the higher it is, the less certain we are about the position of this atom. N: I talked about it earlier, it’s the