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An official website of the United States government

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Https

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A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Coding system

A coding system is the symbolic arrangement of data or instructions in a computer program or the set of such instructions.

Last Updated: Apr 05, 2021