The answer is in the following links:

> Square is creating a new business (joining Seller, Cash App, & Tidal) focused on building an open developer platform with the sole goal of making it easy to create non-custodial, permissionless, and decentralized financial services. Our primary focus is Bitcoin. Its name is TBD. — https://twitter.com/jack/status/1415765941904941061

> We’ve decided to make our official name TBD54566975 based solely on this numerology report [picture]. — https://twitter.com/TBD54566975/status/1424818221652324355

tbDEX: A Liquidity Protocol [1][2][3][4]

[1] https://tbdex.io/whitepaper.pdf

[2] https://twitter.com/tbd54566975

[3] https://github.com/TBDev-54566975

[4] https://tbd54566975.ghost.io/introducing-tbdex/