"APL (named after the book A Programming Language)[6] is a programming language developed in the 1960s by Kenneth E. Iverson."
https://en.wikipedia.org/wiki/APL_%28programming_language%29
"K is a proprietary array processing language developed by Arthur Whitney and commercialized by Kx Systems. Since then, an open-source implementation known as Kona has also been developed.[1] The language serves as the foundation for kdb, an in-memory, column-based database, and other related financial products. The language, originally developed in 1993, is a variant of APL and contains elements of Scheme. Advocates of the language emphasize its speed, facility in handling arrays, and expressive syntax."
https://en.wikipedia.org/wiki/K_programming_language
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