Please don't search for that keyword – such a coin doesn't exist yet. Right now, it is just an idea, but it could prove fruitful.
As is known, the creation of Bitcoin is based on performing certain calculations—meaning its input resources are electricity and computing power. However, this is not the only possible basis for creating a cryptocurrency (or a private currency/asset).
Have you ever imagined a currency/asset whose scarcity arises from the creation of something useful and/or beautiful ?
Not some pointless calculation accompanied by rather negative side effects (noise, excessive heat), but—for instance—beautiful, fully tattooed skin

Yes, the creation of Tattoo Coin is arranged so that one unit of that coin is awarded to every person who is fully tattooed from her/his toes and fingers to face and has no uncovered skin.
Thus, the
input resources for Tattoo Coin are human skin, pain endurance, tattoo machine power, electricity, the tattoo artist's labour, ink...
The
output is not merely (a single unit of) Tattoo Coin, but something so beautiful that we cannot even imagine it right now.
It is possible that many people “mine” Tattoo Coin not so much to acquire the currency/asset itself, but rather for its side effects...I would gladly find co-authors for the Tattoo Coin idea.