What does this mean (+) at the end of a condition ??

Hi All,
What does this notation mean at the end of a condition ?
The notation is (+). I just came across a query that has this notation and it thew me off.
example:
where x.id = y.id (+)
....Thanks,

Its an outer join.
i.e Give me data from x (table) when there is no corresponding link on x.id to y.id.
regards,
Robert.

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