What does bh stand for in pencil?

"BH" in pencils refers to "Black Hard". It's part of the grading system for drawing pencils, which indicates the hardness and darkness of the graphite.

Here's how it breaks down:

* B: Indicates the softness of the graphite. The higher the number (e.g., 8B, 9B), the softer and darker the graphite.

* H: Indicates the hardness of the graphite. The higher the number (e.g., 2H, 4H), the harder and lighter the graphite.

So, "BH" represents a harder graphite that will produce lighter lines compared to a "B" pencil.