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See Chinese contents: GB/T 16903-2021 GB/T 16903-2021: Rules for the presentation of graphical symbols for use on signs -- Design principles and requirements for public information graphical symbols
This standard establishes the rules for the presentation of graphical symbols for use on signs; specifies the requirements for design procedures, design template, design principles, specific graphic design of the public information graphical symbols (hereinafter referred to as graphical symbols); specifies the rules of forming graphic signs through the graphical symbols.
