An unknown is something the mind has not yet properly attained. Since knowledge has two main kinds, what is sought can also differ.
Unknown concept: A learner encounters the technical term “species” (nawʿ) but does not yet understand it. An appropriate definition and explanation may provide the missing conception.
Unknown judgment: Some premises are understood but their implication has not yet been recognized. Linking them correctly may yield a further judgment.
Nazar thus includes work toward both conceptual understanding and assent. A well-formed definition can help acquire a concept, while an argument can help establish a proposition.