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?

Make writing fun and easy with BIC Xtra-Sparkly #2 Mechanical Pencils With Erasers. These 0.7mm mechanical pencils have a medium point that’s ideal

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

BIC Xtra-Sparkle Number 2 Mechanical Pencils, 40-Count Pack, Mechanical Pencils for School

What is a number 2 pencil? - Quora

Sabary 200 Pcs Inspirational Pencils Colorful Mood Pencil with Motivational Sayings Bulk 2 HB Wood Pre Sharpened Cute Pencils with Erasers Back to School Gift for Kindergarten Students from Teacher

Our Tests Prove These Are The Best Pencils in the World

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

Number 2 pencils: What makes them so special?

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What is a number 2 pencil? - Quora

Basics Woodcased #2 Pencils, Pre-sharpened, HB Lead Bulk Box, 150 Count, Yellow : Office Products

Ticonderoga® My First® #2 Pencils with Sharpener, 5 ct - Baker's

no pencil, large reduction Save 86%