Security levels used to be considered with respect to the security clearance levels. The expression "tiers of security" is not typically used as well.

My guess you are interested in security domains. Here below are the recognized typical domains in information security field.

Access Control

Telecommunications and Network Security

Information Security Governance and Risk Management

Software Development Security

Cryptography

Security Architecture and Design

Operations Security

Business Continuity and Disaster Recovery Planning

Legal, Regulations, Investigations and Compliance

Physical (Environmental) Security

Each of these domains is a certain part of information technology having its own set of vulnerabilities, standards, metrics, methods, and protocols to fix vulnerabilities, assess risk factors, and allowing to create security policies and govern security management in the best business interests of any organization.  

Tiers of security are based on context.

If you are talking about network security, then

0. Physical security

1. Network layer security

2. Application layer security

Tiers based on objectives are

1. Confidentiality

2. Authentication

3. Integrity

4. Access control

5. Non-repudiation

6. Availability

Len and Jay already explicated their classifications. Apart from physical and legal security, I rather would conflate all their other items to IT or technical security. I do not see a compelling hierarchy between them, because all three are important and complement each other.