names of metric units
Names of metric units, whether alone or combined with a prefix, always start with a lower case letter (except at the beginning of a sentence).
Prefix for subdivision of 10-9 or 1/1 000 000 000, symbol: n.
National Measurement and Regulation Office (NMRO)
The NMRO provides facilities for legal and scientific metrology at its laboratory at Teddington, Middlesex, and also gives advice and policy support to the UK Government on measurement issues. Web site: https://www.gov.uk/government/organisations/national-measurement-and-regulation-office
Unit of measurement of force, symbol: N.