This guide provides an introduction to the spider diagram, a visual tool used to organize and brainstorm ideas. It explains the basics of creating a spider diagram, including how to use it to identify relationships between ideas, organize information, and generate new ideas. It
From Wikipedia
In mathematics, a unitary spider diagram adds existential points to an Euler or a Venn diagram. The points indicate the existence of an attribute described by the intersection of contours in the Euler diagram. These points may be joined forming a shape like a spider. Joined points represent an "or" condition, also known as a logical disjunction.