A Union Venn diagram is a diagram that shows all possible logical relationships between different categories. The A, B, C, D, and E are the different categories. This template can be used to make your own A Union Venn Diagram. The Union Venn Diagram template is a diagram that helps to show the relationships between sets of things. It is also known as a set diagram. A Venn diagram is a simple way to show all the possible logical relationships between two or more sets of information. The Union Venn Diagram template can be used for many purposes, such as showing the relationship between different departments of an organization or illustrating how different sets of skills are related to each other.