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The # is reference to the hardness of lead A number 2 pencil is averagely hard aka HB
The "number 2" designation refers to the "hardness" of the lead. The higher the number, the "harder" The "7mm" designation refers to the "thickness" of the lead. The higher the number, the thicker. They are not the same pencil.
The number two in reference to a pencil denotes the relative hardness of the graphite or "lead" that is in the pencil, HB being softer and three being harder, etc.
To determine if an unmarked pencil has number 2 lead, you can perform a simple test by making a mark on a piece of paper with the pencil. Then, use your fingernail to gently rub the mark. If the mark is dark and shiny, it is likely number 2 lead, as number 2 lead creates a distinct mark that is easily smudged. Additionally, you can also check for the presence of the number "2" or "HB" on the pencil itself, as these markings are commonly used to indicate number 2 lead.
A standard number 2 pencil typically measures 7.5 inches in length when unsharpened. The diameter of the pencil is generally around 0.3 inches. This size is commonly used for standardized tests and general writing purposes.