Here is an example of the UML sequence diagram. Sequence diagrams, also known as sequence diagrams and sequential diagrams, are UML interaction diagrams of interaction between objects. These objects are arranged in chronological order. This template is a timing diagram of 3PC for reference. Sequence diagrams, also known as sequence diagrams and sequential diagrams, are UML interaction diagrams of interaction between objects. These objects are arranged in chronological order. This template is a timing diagram of 3PC for reference.