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Atlassian doc - Scheme basics
https://confluence.atlassian.com/adminjiraserver/project-screens-schemes-and-fields-938847220.html

Schemes related to projects

List of schemes associated to each project. Most have "default" versions, but most users want specialization from the default. These schemes must be considered when someone asks to "clone" a project.

• Permission Scheme
• Notification Scheme
• Issue Security Scheme
• Workflow Scheme
• Issue Type Scheme
• Issue Type Screen Scheme
• Field Configuration Scheme

Reference diagram for project/objects/relationships

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