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International Standard Industrial Classification. The United Nations system for classifying economic activities, serving as a global baseline concordance.

• NAICS vs. SIC vs. ISIC: Understanding Industrial Classification Systems — A comparative analysis explaining the relationship, scope, and differences between NAICS, legacy SIC, and the international UN ISIC standard.
• SIC ↔ NAICS Concordance Crosswalk — Search and map old SIC codes to modern formats.

1. United Nations Statistics Division: International Standard Industrial Classification of All Economic Activities (ISIC)