Contents Foreword	 Introduction	 1	Scope	 2	Normative References	 3	Terms and definitions	 4	General requirements	 4.1	Proposal for symbols for adoption	 4.2	Requirements for usage	 5	Symbols	 Annex A (Informative) Examples	 Annex B (Normative) Proposal for the adoption of a symbol into YY/T 0466.1	 Annex C (Normative) Basic pattern for symbol design	 Annex D (Informative) Use of the general prohibition symbol	 Bibliography	
 
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