2021GB/T 16903-2021 Rules for the presentation of graphical symbols for use on signs—Design principles and requirements for public information graphical symbols
2008GB/T 16903.1-2008 Rules for the presentation of graphical symbols for use on signs- Part 1:Design principles for public information graphical symbols
1997GB/T 16903.1-1997 Rules for the presentation of graphical symbols--Graphical symbols for use on graphical signs--Part 1: Creation of graphical signs
GB 7093.4-1986 Graphical Symbols was changed to GB/T 16903.1-1997 Rules for the presentation of graphical symbols--Graphical symbols for use on graphical signs--Part 1: Creation of graphical signs.