What is the abbreviation for North american industry classification system?

Looking for the shorthand of North american industry classification system or how to abbreviate it? We have 6 shorthands for North american industry classification system.

NAICS — North American Industry Classification System
NAISC — North American Industry Classification System
NAICS — North American Industrial Classification System
NAIC — North American Industry Classification System
NICS — North American Industry Classification System
NAIC — North American Industrial Classification System