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?

【PRE-SHARPENED, WOOD-CASED & PRETTY-LOOKING】Pre-sharpened means time saver. Our Pencils #2 come pre-sharpened with a nice point and erasers that do a

ECOTREE Pencils #2 HB, Pre-sharpened Pencils with Eraser Cute Pencils Graphite Pencils Sketch Pencils Birthday Pencils Fun Pencils for Kids, Adults

My First Wood-Cased Pencils

Our Tests Prove These Are The Best Pencils in the World

BIC Xtra-Sparkle No. 2 Mechanical Pencils with Erasers, Medium Point (0.7mm), 24 Pencils

This large size (13/32”) round No. 2 pencil is easy for small hands to hold making them ideal for children in the early stages of their writing

4ct My First Ticonderoga #2 Pencils with Sharpener

Number 2 pencils: What makes them so special?

Titanium Premium Wood #2 Pencils 24ct are made from high quality 100% Wood and is certified for Sustained Forestry.Titanium wood cased pencils are

USA Titanium Premium Yellow No.2 Pencils 24 Count Sharpened Woodcase Pencils

Is Dixon's Ticonderoga Truly 'The World's Best Pencil'? We Don't Think So.

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Today is: National No. 2 Pencil Day