Add Symbols chapter

Use table for formatting

Signed-off-by: Arthit Suriyawongkul <[email protected]>

docs/symbols.md

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+# 4 Symbols
+
+List of symbols/abbreviations.
+
+| | |
+|-|-|
+| 3T-SBOM | Tool-to-Tool Software Bill of Material |
+| ABNF | Augmented Backus–Naur form |
+| AI | Artificial Intelligence |
+| BNF | Backus–Naur form |
+| BOM | Bill of Material |
+| CISA | Cybersecurity and Information Security Agency |
+| CISQ | Center for Information and Security Quality |
+| CPE | Common Package Enumeration |
+| CVE | Common Vulnerabilies and Exposures |
+| CVSS | Common Vulnerability Scoring System |
+| EPSS | Exploit Prediction Scoring System |
+| ISO | International Organization for Standardization |
+| JSON-LD | JavaScript Object Notation for Linked Data |
+| KEV | Known Exploited Vulnerabilities |
+| ML | Machine Learning |
+| NISTIR | National Institute of Standards and Technology Internal/Interagency Reports |
+| NTIA | National Telecommunications and Information Administration |
+| OSI | Open Source Initiative |
+| OWL | Web Ontology Language |
+| PAS | Publicly Available Specification |
+| POSIX | Portable Operating System Interface |
+| PTF | Platform Task Force |
+| PURL | Package Uniform Resource Identifier |
+| RDF | Resource Description Framework |
+| RFC | Request For Comment |
+| SBOM | Software Bill of Material |
+| SHA | Secure Hash Algorithms |
+| SHACL | Shapes Constraint Language |
+| SPDX | System Package Data Exchange (previously Software Package Data Exchange) |
+| SSVC | Stakeholder- Specific Vulnerability Categorization |
+| SWHID | SoftWare Heritage persistent IDentifiers |
+| URI | Uniform Resource Identifier |
+| URL | Uniform Resource Locator |
+| VEX | Vulnerability Exploitable eXchange |
+| XML | Extensible Markup Language |