Bitcoin, with its capped supply of 21 million Bitcoin, is often referred to as “sound money” by Bitcoin maximalists. The Ethereum community has proposed that Ethereum (ETH) has earned the right to be called “Ultrasound-money” since Ethereum has become deflationary over time. With the completion of the EIP-1559 London fork, more ether is burned than minted, which means after Eth 2.0 is completed, Ethereum will be fully deflationary.
NFT Term
Ultrasound Money
Definition of Ultrasound Money from the NFTguild.com glossary.

