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Definition: \\

Double backslashes are a prefix to a server name (hostname) in the universal naming convention (see UNC). For example, \\a5\c\expenses is the path to the EXPENSES folder on the C: drive on server A5.

They are also used in several programming languages to reference a single backslash for display and printing, because a single backslash is used to define hexadecimal numbers. For example, \\stage\\cd\\pictures means display or print \stage\cd\pictures. See backslash.