A solidus or slash, /, is a punctuation mark. It is also called a diagonal, separatrix, shilling mark, stroke, or virgule.
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This is in contrast to the backslash \\ which is path delimiter on Microsoft Windows systems. Windows uses the backslash rather than the slash because in the early days of MS-DOS -- before directories were supported! -- the slash was chosen as the command-line option indicator:
In computer programming, the solidus corresponds to Unicode and ASCII character 47, or 0x002F.
A solidus is a gold coin issued by the Romans beginning in the 4th century AD through the Byzantine Empire until the 10th century AD. Later coins are also known by this name.