0.7734 Calculator Pin Badge

Photo of the pin badge placed on top of a bag. The calculator is black, with blue number buttons, red operator buttons and an orange 'equals' bar across the bottom. The screen reads '0.7734'

Photo of the pin badge placed upside down on top of a bag. The calculator is black, with blue number buttons, red operator buttons and an orange 'equals' bar across the top. The screen reads 'heLL.o'

Photo of the pin badge pinned to a grey rucksack. The calculator is black, with blue number buttons, red operator buttons and an orange 'equals' bar across the bottom. The screen reads '0.7734'

Photo of the pin badge pinned upside-down to a grey rucksack. The calculator is black, with blue number buttons, red operator buttons and an orange 'equals' bar across the top. The screen reads 'heLL.o'

Photo of the badge face down on a table. The pin is in the centre, slightly above the middle, and the pin back is a metal clasp.

This smart calculator pin badge displays the mysterious and significant number 0.7734. Nobody really knows what this number means (until you turn your calculator upside down, at which point it just says 'Hello').

Enamel pin badge measures 2.4cm by 3cm, with a single pin fixture on the back (so you can spin it upside down while it's pinned on to things) and a metal pin back. Design by Jamie Gallagher, who also sells a selection of other fun scientific pin badges. We also sell Jamie's Aperiodic Pride pin badge!

Price = (the 127^th prime number) pence = 709 pence = £7.09