721
I dunno
(piefed.cdn.blahaj.zone)
A place for majestic STEMLORD peacocking, as well as memes about the realities of working in a lab.

Rules
This is a science community. We use the Dawkins definition of meme.
How can you be sure it's not defined when we only see one line?
They didn't say it's not defined, they said it's not a valid name. Most languages don't allow function names to start with a number, so 5 literally cannot be a function if that's the case.
But that's assuming this isn't some really obscure language.