Or even [1]. They also made dedicated keyboards for this one [2]. [1]: https://en.m.wikipedia.org/wiki/APL_(programming_language) https://en.m.wikipedia.org/wi

Or even [1]. They also made dedicated keyboards for this one [2]. [1]: https://en.m.wikipedia.org/wiki/APL_(programming_language) https://en.m.wikipedia.org/wiki/APL_(programming_language) [2]: https://www.keyboardco.com/product-images/ibm_model_m_beige_us_apl_usb_large.jpg https://www.keyboardco.com/product-images/ibm_model_m_beige_...