concept map
US /ˈkɑːn.sept ˌmæp/
UK /ˈkɑːn.sept ˌmæp/

1.
a diagram or graphical tool that visually represents relationships between concepts, ideas, or information, often used for organizing and structuring knowledge
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We used a concept map to brainstorm ideas for the new project.
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Creating a concept map helped me understand the complex topic better.