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'NNW' may refer to:

★ National Nurses Week, the week of May 6 through May 12 (Florence Nightingale's birthday) proclaimed by Richard Nixon in 1974 as a period for Americans to recognize nurses' service and contributions

★ Neural network, an interconnected group of neurons or artificial neurons

★ 'North-northwest' or 'Nor-norwest', one of the principal directions on a compass or compass rose, lying at the midpoint between the cardinal direction north and the ordinal direction northwest (''see also:'' boxing the compass)