This is qmk firmware for the new model f https://www.modelfkeyboards.com/

Specifically, its firmware that adds support for APL

APL is a programming language that uses symbols like α∇α⋆∩α⌈∇⌈¨¯←∧¨⌊∩∧⌈+―+¨≤×⌊⌈[?¯< https://en.wikipedia.org/wiki/APL_(programming_language)

This firmware is designed for use with wincompose. Simply install and have wincompose running and the firmware will work right out of the box, key 2 to left of space gives you the apl layer