These days you usually only find nixie tubes used in retro-styled time pieces. But Etsy seller electronico has broken that mould with a stylish necklace that repurposes an old working Russian nixie tube into a fashionable accessory.
The Pi Necklace lists the first 100 decimal places of everyone’s favourite irrational number, pi. It’s the perfect accessory for Pi Day, or any other day, for that matter. [RGB Laboratory via Craziest Gadgets]