What do the initials hb on a pencil stand for?

Answer:
its the HB graphite grading scale, for hardness and darkness of the graphite on paper. the higher the number, like a number 2 pencil, the harder the lead.
First answer by Raven2547. Last edit by Raven2547. Contributor trust: 0 [recommend contributor recommended]. Question popularity: 0 [recommend question].