What does the B in 2b stand for?

Question

The 'Graphite Scale' is used to measure the soft and hardness of the lead. The higher the number, the softer the lead and the harder the mark. A blacker mark will be produced by a 2B lead that is softer than a B lead. On Mar 3, 2017!

Hagrid P Hazard · Accepted Answer

The 'Graphite Scale' is used to measure the soft and hardness of the lead. The higher the number, the softer the lead and the harder the mark. A blacker mark will be produced by a 2B lead that is softer than a B lead. On Mar 3, 2017!

What does the B in 2b stand for?

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