The principal stated as “Depends on abstractions. Do not depend on concretions” is called:

The statement "Depends on abstractions. Do not depend on concretions" is associated with the Dependency Inversion Principle (DIP), which is part of the SOLID principles of object-oriented design. The principle emphasizes that high-level modules should not depend on low-level modules; both should depend on abstractions. This means that it is better to interact through interfaces or abstract classes rather than concrete implementations, which allows for greater flexibility and easier maintenance in software development.

By adhering to this principle, developers can create more modular and adaptable systems, as changes in low-level components won't directly affect high-level components. This helps in reducing the coupling between different parts of a system, ultimately leading to improvements in code reusability and testing.