# 19. System Glossary & Terminology

| Term | Identifier Prefix | Definition |
| :--- | :---: | :--- |
| **Business Capability** | `CAP-` | High-level organizational competency or business domain function. |
| **Business Requirement** | `REQ-` | Measurable functional or non-functional requirement statement. |
| **Architecture Decision Record** | `ADR-` | Immutable decision log documenting system design choices. |
| **Functional Specification** | `FRS-` | Detailed technical contract specification for software features. |
| **Test Case** | `TC-` | Automated or manual test verification suite item. |
| **Change Request** | `CHG-` | ServiceNow ITSM change authorization record. |
| **Incident Ticket** | `INC-` | ServiceNow ITSM production operational incident. |
| **Abstract Semantic Syntax Tree** | `ASST` | Canonical AST representation bridging markdown text and graph nodes. |
| **Customer-Managed Keys** | `CMEK` | AES-256 envelope encryption key controlled by the enterprise client. |
| **Write Once Read Many** | `WORM` | Immutable storage policy ensuring snapshot manifests cannot be overwritten. |