Symantec ESM has the following security levels: red, yellow, and green.
Table: Security levels defines each security level:
Table: Security levels
The summary branch of the enterprise tree displays the security level colors that give you an overall sense of each object's conformity to policy. Symantec ESM depicts each object at its highest level. For example, if one agent in a domain is red, then the entire domain is red. Similarly, if the highest module in a policy is yellow, then the entire policy is yellow.