Iron came from outside of the earth, and so did water. Water came from planetisimal ice. Planetisimal is solid objects in protoplanet disc. Meanwhile, iron was sent to the earth from supernova, a giant star explosion.

Due to these similar phenomena, I combined the word ‘water’ and ‘iron’ to be ‘watiron’. I painted it as a water ball that merges with a bunch of iron gears.