Why are pencils often hexagonal?
Short answer
Hexagonal pencils have flat sides that are easy to grip, and they are less likely to roll away on a desk.
How it works
A round pencil can be held in any direction, but it rolls easily across a desk. A hexagonal pencil has sides and corners that help keep its position, while also giving the hand a stable grip.
Triangular and round pencils have their own advantages. Hexagonal pencils are common because they balance a secure grip with resistance to rolling.
Key point
There is no rule that every pencil must have six sides. Round and triangular shapes are also used for different hands, writing styles, and purposes.