Backslash definitions

băk'slăsh'
A backward virgule (\).
noun
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A short diagonal line (\): a character commonly found on computer keyboards.
noun
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1
(computing, rare, proscribed) Used erroneously in reference to, or in reading out, the ordinary slash, that is, the punctuation mark /.
noun
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2
The symbol (\) used as a separator between folder and file names in DOS and Windows. For example, the path to the Windows version of this encyclopedia is c:\"program files"\CDEweb\CDEweb.exe, which points to the CDEweb.exe file in the CDEweb folder within the Program Files folder on the C: drive.An Unfortunate, Confusing SymbolWhile the backslash (\) is used in Windows addresses, the forward slash (/) is used in Internet addresses, which are Unix based. In addition, the backslash key is in a non-standard keyboard location.Windows followed DOS, which was modeled after CP/M, and CP/M used the forward slash for command line parameters without regard to Unix path compatibility (Unix was big iron at the time, and CP/M was for personal computers). Thus we are stuck with two different symbols to separate file and folder names.Double Backslashes (\\)Two backslashes are used as a prefix to a server name (hostname). For example, \\a5\c\expenses is the path to the EXPENSES folder on the C: drive on server A5. See UNC, \\, path and forward slash.Platform Path to Ovens Folder Windows: \products\kitchen\ovens Unix/Linux, Mac OS X: /products/kitchen/ovens Path to Ovens Page Internet: greatproducts.com/kitchen/ovens.
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(computing) To escape (a metacharacter) by prepending a backslash that serves as an escape character, thereby forming an escape sequence.
verb
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The punctuation mark \.
noun
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2

Origin of backslash

back +‎ slash, because it is a slash going back against the direction of writing, in contrast to the common slash / (“slash, solidus, oblique, forward slash”).