Systems Catalog - All 1,000+ Classification Systems

Systems Catalog - All 1,000+ Classification Systems

TL;DR: Complete catalog of 1,000+ classification systems organized by category. Industry (150+), Life Sciences (100+), Product/Trade (20+), Occupation (15+), Regulatory (100+), and 300+ domain vocabularies - all connected by 326K+ crosswalk edges.

graph LR
  subgraph Top5["Largest Systems by Node Count"]
    NCI["NCI Thesaurus\n211,072"]
    NDC["NDC\n112,077"]
    LOINC["LOINC\n102,751"]
    ICD10CM["ICD-10-CM\n97,606"]
    ICD10PCS["ICD-10-PCS\n79,987"]
  end

World Of Taxonomy connects over 1,000 classification systems as equal peers in a unified knowledge graph. Systems span industry classification, product and trade codes, occupation standards, health and clinical coding, education frameworks, financial and environmental standards, regulatory compliance, and hundreds of domain-specific vocabularies.

Industry classification standards

These are the foundational systems for classifying economic activity by industry sector.

Global and Multi-National

North America

European Union (NACE Rev 2 Family)

NACE Rev 2 is the EU standard. Each member state publishes a national adaptation with the same structure (996 codes):

NACE Rev 2 (EU), ATECO 2007 (Italy), NAF Rev 2 (France), WZ 2008 (Germany), ONACE 2008 (Austria), NOGA 2008 (Switzerland), PKD 2007 (Poland), SBI 2008 (Netherlands), SNI 2007 (Sweden), DB07 (Denmark), TOL 2008 (Finland), CNAE 2009 (Spain), NACE-BEL 2008 (Belgium), CAE Rev 3 (Portugal), CZ-NACE (Czech Republic), TEAOR 2008 (Hungary), CAEN Rev 2 (Romania), and 20+ more national variants.

Asia-Pacific

Latin America (ISIC-based)

CIIU Rev 4 adaptations: Colombia, Argentina, Chile, Peru, Ecuador, Bolivia, Venezuela, Costa Rica, Guatemala, Panama, Paraguay, Uruguay, Dominican Republic - each with 766 codes based on ISIC Rev 4.

Additional National Systems

Over 80 country-specific ISIC Rev 4 adaptations covering Africa, Middle East, Central Asia, Southeast Asia, Caribbean, and Pacific Island nations.

Product and Trade Classification

Occupation and Skills Classification

Life Sciences

Education Classification

Geographic Classification

Financial, Environmental, and Governance

Regulatory and Compliance

Over 100 regulatory frameworks including HIPAA, SOX, GDPR, OSHA standards, FDA regulations, SEC rules, PCI DSS, NIST frameworks, ISO management system standards, and international agreements (Basel, FATF, ILO Conventions).

Domain-Specific Vocabularies

Over 300 domain taxonomies covering specialized sectors:

• Transportation: truck freight types, vehicle classes, cargo classification, carrier operations, pricing, regulatory compliance
• Agriculture: crop types, livestock, farming methods, commodity grades, equipment, input supply, land classification
• Mining: mineral types, extraction methods, reserve classification, equipment, safety
• Construction: trade types, building types, project delivery, materials, sustainability
• Manufacturing: process types, quality, operations models, industry verticals
• Healthcare deep-dives: hospital departments, nursing specialties, lab categories, surgical specialties, pharmacy types
• Finance deep-dives: insurance products, credit ratings, derivatives, private equity stages
• Technology: API architectures, database types, programming paradigms, DevOps, MLOps, cybersecurity
• Energy: oil grades, natural gas, solar, wind, battery, smart grid, carbon credits

Web and Semantic Vocabularies

These vocabularies define types and concepts used by AI assistants, search engines, and structured-data crawlers. They anchor what real-world things mean across the public web.

Financial Ontologies

Financial Ontologies

Lexical Resources

Process / Activity Frameworks

Patent Classification

Academic and Research

How to Explore Systems

Use these API calls to explore the catalog programmatically:

# List all systems
curl https://worldoftaxonomy.com/api/v1/systems

# Group by region
curl "https://worldoftaxonomy.com/api/v1/systems?group_by=region"

# Filter by country
curl "https://worldoftaxonomy.com/api/v1/systems?country=DE"

# System detail with root codes
curl https://worldoftaxonomy.com/api/v1/systems/naics_2022