| Label | Concept definition | Figure(s) | Code |
|---|---|---|---|
| NAMED_LAND_TRACT | A <TRACT> of natural scenery, defined by its geographical characteristics and known by its proper name. | 788 | |
| NAMED_MAP_LOCATION | A <LOCATION> that normally does not appear as a specific, characterized <OBJECT> on a <MAP> but has a name that is required to be placed on the <MAP>. | 789 | |
| NATIONAL_PARK | An extensive <REGION> of a particular nature that has been defined by law and is to be protected as a whole; it meets the prerequisites of a <NATURE_RESERVE> for the largest part and has been influenced by <HUMAN>s at most only to a small extent; national park. | 790 | |
| NATURAL_AIR_OBSTRUCTION | An existing <OBJECT> of fixed <<HEIGHT_AGL>> or natural growth at a fixed <LOCATION> within a proscribed <REGION> (for example: adjacent to an <AERODROME>) with reference to which vertical clearance is or must be provided during flight operations; natural air obstruction. | 791 | |
| NATURAL_GAS_RIG | A <RIG> for the collection of natural gas from a <WELL>; natural gas rig. | 792 | |
| NATURE_RESERVE | A <REGION> that has been legally defined and the nature and landscape of which require special protection, be it in part or as a whole, in order to preserve symbioses or biotypes of specific wildlife <NON_HUMAN_ANIMAL>s or <PLANT>s: for scientific reasons; for reasons of natural or geographic history; or because of their rareness, uniqueness, or outstanding beauty; nature reserve. | 793 | |
| NAUTICAL_CLUB | The <BUILDING>s, <GROUNDS>, and <DOCK>s of an organization that promotes and supports yachting, sailing, and boating; nautical club. A nautical club is also known as a yacht club or sailing club. | 794 | |
| NAVIGABLE_WATERWAY | A <WATERCOURSE> that is usable, sometimes after improvements, as a commercial <WATERBODY_ROUTE>; navigable waterway. | 795 | |
| NAVIGATION_BUOY | A <BUOY> serving as a <MARINE_AID_TO_NAVIGATION>; navigation buoy. | 796 | |
| NAVIGATION_DEVICE | Any visual or electronic <DEVICE>, usually located within a <VEHICLE>, that provides point-to-point guidance information or <LOCATION> data; navigation device. A navigation device is also known as a navigation aid. | 797 | |
| NAVIGATION_LIGHT | A specially constructed <DEVICE> that displays a <LIGHT> as an <AID_TO_NAVIGATION>; navigation light. | 798 | |
| NAVIGATION_LINE | A <LINE> between two <AID_TO_NAVIGATION>s that extends towards the <REGION> of navigational interest; navigation line. | 799 | |
| NAVIGATION_MARK_AFLOAT | A floating <STRUCTURE> providing a reference <LOCATION> for navigation; navigation mark afloat. | 800 | |
| NAVIGATION_MARK_FIXED | A fixed <STRUCTURE> providing a reference <LOCATION> for navigation; navigation mark fixed. | 801 | |
| NAVIGATION_RADAR_RANGE | A <WATERBODY_REGION> within range of a <RADAR_STATION>; navigation radar range. Inside this <REGION> a <VESSEL> may request navigation radar assistance from <SHORE>, particularly in poor visibility. | 802 | |
| NAVIGATION_RESTRICTED_REGION | A <REGION> in which certain aspects of navigation are restricted. | 803 | |
| NEAP_TIDE | A <TIDE> of decreased range (or tidal <WATER_CURRENT>s of decreased <<WATER_CURRENT_SPEED>>) occurring semi-monthly as the result of the <MOON> being in quadrature; neap tide [TCG, "neap tides or tidal currents"]. The neap range of the <TIDE> is the mean range occurring at the time of neap <TIDE>s and is most conveniently computed from the harmonic constants. It is smaller than the mean range where the type of <TIDE> is either semi-diurnal or mixed and is of no practical significance where the type of <TIDE> is predominantly diurnal. | 804 | |
| NEARSHORE_PRECISE | The <TERRAIN_STRIP> that is located between the 10 metre <DEPTH_CURVE> and the <LOW_WATER_LINE> defined by either mean low water springs or mean lower low water as defined by the applicable National Authority; nearshore precise. | 805 | |
| NEBULA | An immense body of highly rarefied gas and dust in the interstellar spaces of <GALAXY>s; nebula. | 806 | |
| NEPTUNE | The primary <PLANET> of the <SUN> that is normally eighth in distance from the <SUN>, with an orbital mean <<RADIUS>> of approximately 4 504,4 million kilometres; Neptune. | 807 | |
| NETWORK | A <SYSTEM> of inter-connected <OBJECT>s of either the same type or directly related types; network. | 808 | |
| NEWSPAPER_PLANT | A <BUILDING> used in the printing, collating, storage, or distribution of a newspaper; newspaper plant. | 809 | |
| NON_AQUEOUS_CLOUD | An <AEROSOL> of non-aqueous <PARTICLE>s (for example: <SMOKE> and/or <DUST>); non-aqueous cloud. | 810 | |
| NON_COMMUNICATION_TOWER | A <TOWER> that is used for non-communication purposes (for example: observation, support, and/or storage). | 811 | |
| NON_EMPTY_SET | A <SET> with at least one member; non-empty set. | 812 | |
| NON_HUMAN_ANIMAL | An <ANIMAL> other than a <HUMAN>; non-human animal [SOED, "animal", A.a]. | 813 | |
| NON_SUBMARINE_CONTACT | Any <OBJECT> (for example: a <MARINE_WRECK>) on a <WATERBODY_FLOOR> that could be mistakenly identified as an operable <SUBMERSIBLE_VESSEL> when detected with acoustic or magnetic <SENSOR>s; non-submarine contact. | 814 | |
| NUCLEAR_REACTOR | <EQUIPMENT>, which may be contained within a <POWER_PLANT> or <VESSEL>, in which a nuclear chain reaction is initiated, sustained, and controlled; nuclear reactor. | 815 | |
| NUCLEAR_WEAPONS_FACILITY | A <FACILITY> used for the construction, assembly, storage, or dismantling of nuclear <WEAPON>s. | 816 |
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