spider diagram 

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Subclass of	diagram
Named after	Araneae
Depicts	logical disjunction
Based on	Euler diagram Venn diagram
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A 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 together forming a shape like a spider. These represent an OR condition, also known as a logical disjunction.