AutoLISP

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AutoLISP is a dialect of the programming language LISP, designed specifically for use within Autodesk's AutoCAD software. It is primarily used for creating custom commands, automated workflows, and extending the functionality of AutoCAD.

Hello, world:

(printc "Hello World!")

Popularity: Less than 1% of developers are using or have used this language.*
*According to StackOverflow's 2023 survey.