R-squared value, denoted by R2, is squared Pearson correlation coefficient (aka Pearson's product moment coefficient) is a measure of linear correlation between two sets of data.
Its value meaning: https://condor.depaul.edu/sjost/it223/documents/correlation.htm
A unique and non-interchangeable unit of data stored on a digital ledger (blockchain). NFTs can be used to represent easily-reproducible items such as photos, videos, audio, and other types of digital files as unique items (analogous to a certificate of authenticity), and use blockchain technology to establish a verified and public proof of ownership. Copies of the original file are not restricted to the owner of the NFT, and can be copied and shared like any file. The lack of interchangeability (fungibility) distinguishes NFTs from blockchain cryptocurrencies, such as Bitcoin.
NFT ใช้ทำ DRM (digital right management)
https://en.wikipedia.org/wiki/Non-fungible_token
Fungible = interchangeable