It is forth-specific. It refers to blocks of 1024 bytes of code, arranged in 64 columns by 16 lines and manipulated through a more-or-less standard vocabulary[

It is forth-specific. It refers to blocks of 1024 bytes of code, arranged in 64 columns by 16 lines and manipulated through a more-or-less standard vocabulary[1], supported by most Forth systems. You can see it in action in e.g. the CollapseOS emulator[2], as it comes preloaded with ~300 blocks: try writing "0 LIST" (uppercase, as it is case-sensitive - see also [3]). [1]: https://forth-standard.org/standard/block/ https://forth-standard.org/standard/block/ [2]: https://schierlm.github.io/CollapseOS-Web-Emulator/ https://schierlm.github.io/CollapseOS-Web-Emulator/ [3]: https://incoherency.co.uk/collapseos/blk.txt.html https://incoherency.co.uk/collapseos/blk.txt.html