Recognition of Ignorance on a Topic
I heard a talk recently in which a Zen master said ignorance in Buddhism really meant a lack of awareness of the mind (i.e. letting it wander in stories and daydreams), rather than the normal meaning of ignorance.

I don't know if this is orthodox Buddhism (or orthodox Zen for that matter), but it makes more sense to me than interpreting 'ignorance' as factual ignorance.