Clues
Clues point the PCs towards some sort of knowledge, conclusion, or revelation. They are signifiers of something else. They are nouns that tell stories.
Present clues when PCs Seek Insight, as a way to begin and end with the fiction as you answer their questions. Use them to announce trouble or hint at more than meets the eye, to offer an opportunity, or to make any other GM move that involves imparting knowledge or establishing facts.