K - Programming language

K is a programming language created in 1993 by Arthur Whitney.

#433on PLDB

30Years Old

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. The language serves as the foundation for kdb+, an in-memory, column-based database, and other related financial products. Read more on Wikipedia...

K Wikipedia page
K first developed in Kx Systems
file extensions for K include k
There are 2,478 Project Euler users using K
Explore K snippets on Rosetta Code
K on HOPL
Pygments supports syntax highlighting for K
See also: (8 related languages)Scheme, Q, APL, SQL, J, SQL-92, Solaris, Linux

Example from hello-world:

"Hello World\n"

Example from the Hello World Collection:

/ Hello world in K

"Hello world!"