A type of Romex cable (nonmetallic sheathed cable that contains several conductors). The cable, which is flame-retardant, is limited to use in dry locations only and can not be exposed to excessive moisture. Found on http://www.encyclo.co.uk/local/20933
Abbreviation for Négociant Manipulant; see there. NM (Normalized Must Scale) is also a unit of measurement for must weight or quality classification of wine in Slovakia (Normalizovaný Muštomer) and the Czech Republic (Normalizovaný Moštoměr): 1 °NM corresponds to 1 kg of sugar per 100 l of must. Found on https://glossary.wein.plus/nm