A person may believe in something, then he doesn't have knowledge about that something.
If a person has knowledge about S, then he is able to falsify ~S (not S), otherwise he doesn't have knowledge, but belief.
If a person can falsify ~S, then S is true
If there's no way to falsify S, then it is truth if and only if S is verified.
But then S is an analytic truth.
If the truth S is non analytic, then it must be verified, and there's no unverifiable S.
Any factual truth are such due to the nature, and each nature has its own set of factual truths, otherwise we'd have a chaos.
A dot has size. A dot has endurance/continuity in time.
A dot has no form, so I don't know how a dot can be identified.
A non-identifiable dot may be anything, so we don't know what we've been looking for.
A non-identifiable dot is imaginary.
Any imaginary dots are not real, and if they're non-real, they're not factual.
Since a dot cannot be verified, it doesn't be checked and we're not sure about its true.