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UN number stresses
gen.	номер по классификации ООН (UN numbers or UN IDs are four-digit numbers that identify hazardous substances, and articles (such as explosives, flammable liquids, toxic substances, etc) in the framework of international transport. wiki Alexander Demidov)
avia.	номер по списку ООН
chem.	номер ООН (идентификационный номер вещества Pothead)
sec.sys.	идентификационный номер по списку опасных веществ ООН (wikipedia.org ВВладимир)
English thesaurus
UN number
avia.	The four-digit number assigned by the United Nations Committee of Experts on the Transport of Dangerous Goods to identify a substance or a particular group of substances.