1. The problem asks if diagrams can be identified without pictures. 2. Diagrams are visual representations, so without pictures, identification relies on descriptions, symbols, or data. 3. Important rule: To identify a diagram without a picture, one must use textual or symbolic information that describes its structure or properties. 4. For example, a graph can be described by its vertices and edges, or a geometric figure by its side lengths and angles. 5. Therefore, while pictures help, diagrams can be identified through detailed descriptions or symbolic representations.