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Unified Modeling Language (UML), a semi-formal language used for modeling different types of systems, created by Grady Booch, James Rumbaugha and Ivara Jacobson, now developed by Object Management Group.

It is used to model the domain of the problem (describing-modeling a fragment of an existing reality-for example, modeling what a department does in a company)-when used for analysis, and to model a reality that is It is only created – it is formed mainly by models of information systems. UML is typically used together with its graphical representation, which is attributed to the corresponding symbols tied together in diagrams.

This is a very useful tool that can help you communicate with other people when working on large projects.  It allows you to visually describe the relationships between different game elements. An example of a program that supports this language is mentioned once I used Diagram Painter