Standard ML

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Standard ML (SML) is a general-purpose programming language that supports functional, imperative, and concurrent programming paradigms. It is mainly used for academic research, programming language theory, and development of type-safe and high-performance software systems.

Hello, world:

print "Hello world!\n"

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