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That's not on my keyboard... Can I just stick with "ineffable"?
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Not exactly, it doesn't look like the definition or even connotations of "ineffable" include "unknown".
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It does in the sense that ineffable things are unable to be described in language (conceptually: unknown to language).
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Anything that is known can be described in language by giving it a name.
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Hey, that's today's smbc https://www.smbc-comics.com/comic/r The problem is, there's no good reason to think the concept of 彊 in your mind is at all similar to the concept of 彊 in my brain. After all, we (probably) don't pronounce it the same, right?
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This sounds like a SCP entry

Perhaps the meaning of this character is sealed in some vault

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More mundanely, you could also use it as a marker character, given that nobody except for sneaky little QA hobbitses will ever use it in their input.
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So www.catb.org/~esr/jargon/html/M/mu.html
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