Ran a Pirate campaign once. Had a pirate faction of Dwarfs called the Reefbeards.
They lived up, under and along the water for so long, they had colorful corals growing in their beards.
They also had a lot of cool technology, so they shot grapplehooks to swing over and ran around with entire cannons on their back.
It is indeed certified by the entire scientific community and using official measurements that has been developing for centuries called metric.
Since it is in centimeters, lol