Number 2 pencils: What makes them so special?

It's a staple on everyone's back-to-school list, but why do we always use No. 2 pencils? They really are the best writing utensil for the job.
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They're at the top of every back-to-school list, but does anyone know why No. 2 pencils are so important?

Why is my pencil made of 2 different types of wood? : r/pencils

Pre-sharpened No. 2 Pencils by Staedtler Mars GmbH & Co. STD13247C144ATH

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What Makes #2 Pencils So Special?

Mr. Pen jumbo pencils are perfect for young children who are just learning to write. The large diameter makes them easy to grip, and the soft graphite

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Our Tests Prove These Are The Best Pencils in the World

One 40-count pack of BIC Xtra-Smooth Bright Edition No. 2 Mechanical Pencils With Erasers Versatile 0.7mm medium point is ideal for a variety of

BIC Xtra-Smooth Mechanical Pencils with Erasers (MPCE40-BLK), Bright Edition Medium Point (0.7mm), 40-Count Pack, Bulk Mechanical Pencils for School

Noted by Post-it®, Mechanical Pencils, Multicolor, 3 Pens/Pack