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The process of assigning HS codes is known as "HS Classification". All products can be classified in the HS by using the General Rules for the Interpretation of the Harmonized System ("GRI") that must be applied in strict order. HS codes can be determined by a variety of factors including a product's composition, its form and its function.
The Harmonized Tariff Schedule classifies a good based on its name, use, and/or the material used in its construction and assigns it a ten-digit classification code number, and there are over 17,000 unique classification code numbers.
Toll-free telephone numbers in the North American Numbering Plan have the area code prefix 800, 833, 844, 855, 866, 877, and 888. Additionally, area codes 822, 880 through 887, and 889 are reserved for toll-free use in the future. 811 is excluded because it is a special dialing code in the group NXX for various other purposes.
Other countries maintain an autonomous numbering plan with distinct country codes within the international E.164 specifications by the International Telecommunication Union. Original North American area codes; List of North American Numbering Plan area codes; Telephone numbers in Mexico; Telephone numbers in Greenland
Each NPA is identified by one or more numbering plan area codes (NPA codes, or area codes), consisting of three digits that are prefixed to each local telephone number having seven digits. A numbering plan area with multiple area codes is called an overlay. Area codes are also assigned for non-geographic purposes.
UPC-A compatible - Used to issue restricted circulation numbers within a company 050–059: UPC-A compatible - GS1 US reserved for future use 060–099: UPC-A compatible - United States: 100–139 United States: 200–299: Used to issue GS1 restricted circulation number within a geographic region [1] 300–379 France and Monaco: 380 Bulgaria ...
Many of these telephone numbers are selected from the easily recognizable codes (ERCs). System-wide toll-free calling, for which the receiving party is billed for the call, uses the number range with area codes of the form 8XX. Area code and central office prefixes for other non-geographic services have the form 5XX-NXX.
The ten-digit telephone numbers of the North American Numbering Plan consist of a three-digit numbering plan area code (NPA code), written as the most-significant part of the national telephone number, followed by the three-digit central office code, and the four-digit local line or station number.