National Teaching and Learning Change ProgrammeInformation and Communication Technology:
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• noise
  Electrical disturbances affecting the transmission of intended signals. When the noise level is too high, effective transmission ceases. The comparison of the strength of the signal with the level of noise is called the signal-to-noise ratio.
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• non-breaking space
  The type of space which appears between words that should not appear on separate lines (for example, the space between the words in 'Henry IV').
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• non-printing character
  Many character sets have special codes for certain characters, such as characters indicating the start or end of a file, or the return key, etc. These characters are not printed out.
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• NOR
  In Boolean logic, NOR produces a result that is the inverse of logical OR.
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• NOR gate
  The output of a NOR gate is TRUE only if all inputs are FALSE, otherwise the output is FALSE.
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• normalisation
  The process of designing a database according to the five generally accepted rules of normal forms. Normalisation is a technique designed to ensure that the data structures used in a system are efficient and maintain integrity, for example, to remove duplication of data.
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• normalise
  The process of designing a database according to the five generally accepted rules of normal forms. Normalisation is a technique designed to ensure that the data structures used in a system are efficient and maintain integrity, for example, to remove duplication of data.
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• NOT
  In Boolean logic, it reverses something, e.g. IF NOT (wet) means if it is dry.
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• NOT gate
  The output of a NOT gate is the inverse of its input. If the input is TRUE then the output is FALSE and if the input is FALSE then the output is TRUE.
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• notebook
  A notebook computer runs off battery power as well as mains electricity. It is normally between 2kg and 3kg in weight, and is about the size of an A4 sheet of paper so it can fit into a briefcase easily. They are also called laptop computers.
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• number base
  The underlying principles of a system of counting, e.g. people normally use base 10 (decimal), whereas computers use base 2 (binary).
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• numbered list
  A list of items in numerical order.
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• numeric data type
  A formal description of the kind of numeric data being stored or manipulated within a program or system, for example, integers and real numbers.
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• numeric field type
  Specifies the kind of numeric data held by a field in a record.
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• numeric keypad
  On some keyboards, the numeric keys are repeated as a separate block called a numeric keypad. This aids rapid one-handed data entry.
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• numeric overflow
  A numeric overflow is the result of a numeric calculation which becomes too large to be stored in the space reserved for numbers.
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• numeric type
  The type of a variable, field, etc., used to store numbers (as opposed, for example, to characters).