Oracle SQL Code

I generally use Microsoft SQL, however I have recently had to access and Oracle Server and have been given some code to run. The code contains many || ( two vertical parallel lines). Can someone please educate me on their meaning/usage? Thanks
SeTechAnalystAsked:
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Ryan ChongBusiness Systems Analyst , ex-Senior Application EngineerCommented:
in short it's joining the chars

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johnsoneSenior Oracle DBACommented:
That is a string concatenation operator.

The documentation is your friend -> http://docs.oracle.com/cd/E11882_01/server.112/e41084/operators003.htm#SQLRF51158
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