The two slashes // may indicate: * a

comment Comment may refer to: Computing * Comment (computer programming), explanatory text or information embedded in the source code of a computer program * Comment programming, a software development technique based on the regular use of comment tags ...

marker in several programming languages including C, C++, JavaScript and Java * the

root directory In a Computing, computer file system, and primarily used in the Unix and Unix-like operating systems, the root directory is the first or top-most Directory (computing), directory in a hierarchy. It can be likened to the trunk of a Tree (data st ...

path in

Domain/OS Domain/OS is the discontinued operating system used by the Apollo/Domain line of workstations manufactured by Apollo Computer. It was originally launched in 1981 as AEGIS, and was rebranded to Domain/OS in 1988 when Unix environments were added ...

* the operator for

integer division Division is one of the four basic operations of arithmetic. The other operations are addition, subtraction, and multiplication. What is being divided is called the ''dividend'', which is divided by the ''divisor'', and the result is called the ...

, in Python 2.2+ and other programming languages * the empty pattern in

Perl Perl is a high-level, general-purpose, interpreted, dynamic programming language. Though Perl is not officially an acronym, there are various backronyms in use, including "Practical Extraction and Reporting Language". Perl was developed ...

, which evaluates the last successfully matched regular expression * the logical defined-or operator in Perl, called the null coalescing operator in other programming languages * the authority indicator in the

URI scheme A Uniform Resource Identifier (URI), formerly Universal Resource Identifier, is a unique sequence of characters that identifies an abstract or physical resource, such as resources on a webpage, mail address, phone number, books, real-world obje ...

, which follows a colon (://) from the scheme component * the descendant-or-self axis specifier in

XPath XPath (XML Path Language) is an expression language designed to support the query or transformation of XML documents. It was defined by the World Wide Web Consortium (W3C) in 1999, and can be used to compute values (e.g., strings, numbers, or ...

* a double

vertical bar The vertical bar, , is a glyph with various uses in mathematics, computing, and typography. It has many names, often related to particular meanings: Sheffer stroke (in logic), pipe, bar, or (literally, the word "or"), vbar, and others. Usage ...

(, , ) where the vertical line character is unavailable for technical reasons * the

parallel operator The parallel operator \, (pronounced "parallel", following the parallel lines notation from geometry; also known as reduced sum, parallel sum or parallel addition) is a binary operation which is used as a shorthand in electrical engineering, ...

stylized in pseudo-italics * a

caesura 300px, An example of a caesura in modern western music notation A caesura (, . caesuras or caesurae; Latin for "cutting"), also written cæsura and cesura, is a metrical pause or break in a verse where one phrase ends and another phrase beg ...

in musical notation * a

diaphoneme A diaphoneme is an abstract phonology, phonological unit that identifies a correspondence between related sounds of two or more variety (linguistics), varieties of a language or language cluster. For example, some English varieties contrast the ...

in linguistic transcription

See also