4NT may refer to:
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4NT (bridge), a bid in the game of bridge, especially contract bridge
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4NT (shell), a command-line interpreter for Microsoft Windows
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4NT internal variable
An environment variable is a dynamic-named value that can affect the way running processes will behave on a computer. They are part of the environment in which a process runs. For example, a running process can query the value of the TEMP env ...
{{disambiguation, letter number