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  2. Engineering drawing abbreviations and symbols - Wikipedia

    en.wikipedia.org/wiki/Engineering_drawing...

    controlled radius: Radius of an arc or circle, with no flats or reversals. This strict version of radius definition is specified in demanding applications when the form of the radius must be controlled more strictly than "just falling within the dimensional tolerance zone".

  3. Territorial waters - Wikipedia

    en.wikipedia.org/wiki/Territorial_waters

    Territorial sea is a belt of coastal waters extending at most 12 nautical miles (22 km; 14 mi) from the baseline (usually the mean low-water mark) of a coastal state. [6] The territorial sea is sovereign territory, although foreign ships (military and civilian) are allowed innocent passage through it, or transit passage for straits ; this ...

  4. List of countries and territories by number of land borders

    en.wikipedia.org/wiki/List_of_countries_and...

    The length of each border is included, as is the total length of each country's or territory's borders. [ 1 ] Countries or territories that are connected only by man-made structures such as bridges, causeways or tunnels are not considered to have land borders.

  5. Geofence - Wikipedia

    en.wikipedia.org/wiki/Geofence

    A geofence can be dynamically generated (as in a radius around a point location) or match a predefined set of boundaries (such as school zones or neighborhood boundaries). The use of a geofence is called geofencing, and one example of use involves a location-aware device of a location-based service (LBS) user entering or exiting a geofence ...

  6. Circle of latitude - Wikipedia

    en.wikipedia.org/wiki/Circle_of_latitude

    Part of the border between Guinea and Sierra Leone. 8°N: Part of the border between Somalia and Ethiopia. 1°N: Part of the border between Equatorial Guinea and Gabon. 1°S: Most of the border between Uganda and Tanzania, and a very short section of the border between Kenya and Tanzania in Lake Victoria. 7°S

  7. City limits - Wikipedia

    en.wikipedia.org/wiki/City_limits

    City limits or city boundaries refer to the defined boundary or border of a city. The area within the city limit can be called the city proper. Town limit/boundary and village limit/boundary apply to towns and villages. Similarly, corporate limit is a legal name that refers to the boundary of municipal corporations.

  8. Buffer zone - Wikipedia

    en.wikipedia.org/wiki/Buffer_zone

    Modern buffer zone on the Belarus-Poland border in Brest with a security electric fence, a ploughed trace-control strip to show signs of passage, and a pillbox. A buffer zone, also historically known as a march, is a neutral area that lies between two or more bodies of land; usually, between countries. Depending on the type of buffer zone, it ...

  9. Borderline tree - Wikipedia

    en.wikipedia.org/wiki/Borderline_tree

    It is a concept that comes from variable radius plots, or point sampling. It happens when a tree cannot be easily determined as in or out when using a prism or angle gauge. Borderline trees occur only when the distance from the sampling point to the center of the tree is equal to the DBH times plot radius factor (PRF). The PRF is determined ...