The term 'KIND OF DIAGRAM IN LOGIC' can be answered with the four-letter word 'Venn'. A Venn diagram is a type of diagram used in logic and set theory to illustrate relationships between different sets of objects. It consists of overlapping circles, each representing a set, and the area where the circles overlap represents the elements that are shared between the two sets. Venn diagrams are often used to visualize relationships between different groups or concepts.