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Normalnull. Normalnull ("standard zero") or Normal-Null (short N. N. or NN ) is an outdated official vertical datum used in Germany. Elevations using this reference system were to be marked Meter über Normal-Null (“meters above standard zero”). Normalnull has been replaced by Normalhöhennull (NHN).
Null (SQL) The Greek lowercase omega (ω) character is used to represent Null in database theory. In SQL, null or NULL is a special marker used to indicate that a data value does not exist in the database. Introduced by the creator of the relational database model, E. F. Codd, SQL null serves to fulfil the requirement that all true relational ...
Das Normalnull (auch Normal-Null, abgekürzt NN oder N. N.) war von 1879 bis 1992 das festgelegte Nullniveau der amtlichen Bezugshöhe in Deutschland. Umgangssprachlich wird die nunmehr veraltete Bezeichnung über Normalnull und die Abkürzung mNN oft als Synonym für über dem Meeresspiegel verwendet, fälschlicherweise auch für Gebiete außerhalb Deutschlands.
Normalnull. Il Normalnull ( NN, in tedesco "zero normale") fu il riferimento tedesco per misure altimetriche, riferito al mare del Nord e utilizzato durante il XX secolo. Oggi è il sistema di misurazione dell'altitudine nelle mappe topografiche .
The municipality ( Gemeinde) of Ittlingen covers 14.11 square kilometers (5.45 sq mi) of the district of Heilbronn, in German state of Baden-Württemberg. Ittlingen lies along the northwest edge of Heilbronn's district, on its border with the Rhine-Neckar district to the north. The municipal area is physically located in the Kraichgau ...
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