Argument from Ignorance (Ad Ignorantiam): This fallacy occurs when someone asserts that a proposition is false because they personally haven't heard of it, or it's not commonly known to them.

“Well, I've never heard of that” ⟶ Implies: “Therefore, it's probably wrong or not credible.”

It’s an epistemic fallacy, where the absence of knowledge is treated as evidence of absence or insignificance.

Essentially, your ignorance of the subject matter doesn't mean it doesn't exist, it just means you're ignorant of the subject matter. 🤷 🤣