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NN abbr.
abbr.	ich weiß den Namen nicht
abbr., construct.	Normal-Niveau; Normalnull
abbr., engl.	national number (Лорина)
abbr., math.	Normalnull
abbr., metrol.	Normal-Null
Nn abbr.
abbr., el.chem.	Neutronium
abbr., energ.ind.	Nenn-Nutzleistung
nn abbr.
abbr., energ.ind.	Nenndrehzahl