3.725254969642999e-321

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3.725254969642999e-321 is a simple stack-based esolang created by User:Quelklef wherein the stack must only ever consist of valid IEEE 754 64-bit NaN values, or the interpreter will crash.

Example

Hello, world!

push nan/a'H  put/char -- H
push nan/a'e  put/char -- e
push nan/a'l  put/char -- l
push nan/a'l  put/char -- l
push nan/a'o  put/char -- o
push nan/a',  put/char -- ,
push nan/x'20 put/char -- space
push nan/a'w  put/char -- w
push nan/a'o  put/char -- o
push nan/a'r  put/char -- r
push nan/a'l  put/char -- l
push nan/a'd  put/char -- d
push nan/a'!  put/char -- !
push nan/x'0A put/char -- newline
stop

Also see

the Github repo.