What is the name of this UI element that contains two lists? [duplicate]

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What is the name or phrase used to describe the above (admittedly quickly put together UI for the sake of this question) element?

Most of the implementations of it have had these common functions:

  • The left hand list usually contains the list of all "available" items
  • The right hand side contains all the "selected" items
  • The user can select one or more of the items on the left hand side and click the > button to move them to the right hand side to indicate they are to be "selected"
  • Sometimes there is a < button to do the opposite

Here is another real world example of this element from Outlook.

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