Mouse is a programming language created in 1970.
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The Mouse programming language is a small computer programming language developed by Dr. Peter Grogono in the late 1970s and early 1980s. It was developed as an extension of an earlier language called MUSYS, which was used to control digital and analog devices in an electronic music studio. Read more on Wikipedia...
"Hello World" '! !' $
1 N: ~ initialize N to 1 ( N. N. * ! " " ~ begin loop; print squares of numbers N. 10 - 0 < ^ ~ exit loop if N >= 10 N. 1 + N: ) $ ~ increment N and repeat loop