Created by Onoto, with its classic magna shape, the Pi Pen is perfect for mathematicians and engineers, celebrating the famous ‘irrational number’. This distinctive pen is complemented by sterling silver fittings and has the Pi digits engraved around the cap and barrel. It features 314 digits after the decimal point and is available in a limited edition of 314 pieces.

Onoto, established in 1905, is a quintessentially British fountain pen-crafter, connecting historic innovations with the preservation of traditional pen-making skills.

Visit onoto.com to view their full range.