National Teaching and Learning Change ProgrammeInformation and Communication Technology:
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• unary operator
  An operator which acts on a single piece of data, e.g. ++.
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• underline
  Drawing a line under a word or words to emphasise them.
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• undo
  To undo an action is to go back one stage to before the last action was taken. A common function in many programs.
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• uniform resource locator (URL)
  The address for data on the internet. Each resource, which is usually a file, has a name, its URL, which specifies the file or data and the location where it is stored. The URL includes the transfer protocol to be used, for example http, the domain name where it is stored, and other information such as its individual file name.
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• uninstall
  Remove a program or piece of hardware from a computer.
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• universal serial bus (USB)
  A universal serial bus (USB) is used to connect devices, e.g. scanners, speakers and digital cameras, to a computer via a high speed single wire connection.
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• Unix
  An operating system.
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• unmetered internet access
  Usually refers to dial-up internet access for which a flat fee is paid, rather than the user being charged for the length of time they use the phone line.
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• unordered list (1)
  A list of data on a web page which is not in any order.
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• unordered list (2)
  A list of data on a web page which is not in any order.
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• unreasonable data
  Data which, in the context, would not be expected to be there, e.g. in a list of employees, if the age of a particular employee was given as five years old, this would be unreasonable.
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• unset
  A flag is an indicator with two states, true or false. To begin with the flag may be unset (false) and when a particular case is detected it is set (true); when the action has been completed it is unset again (back to false).To unset a flag is to make it false.
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• unsubscribe
  Removing yourself from a mailing list or newsgroup.
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• update
  In data processing, to update a record is to amend it so it has the latest information.
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• update
  In software development, an update is a minor release of software that includes corrections, but does not usually include any significant new features.
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• upgrade
  To upgrade a computer or software is to install and use a newer version.
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• upload
  The term commonly used to refer to the transfer of a file from one computer to another. When the user is sending the file to another site, the term used to describe the operation is upload.
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• upper case
  Capital letters, for example UPPER CASE. Opposite of lower case.
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• usability
  A part of the design process for a website. The aim is to ensure that the site is effective by making it easy to use and meeting the needs of the user.
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• USB port
  The interface for a universal serial bus (USB).