What’s the use/meaning of the @ character in variable names in C#?

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Straight from the C# Language Specification, Identifiers (C#)
:

The prefix “@” enables the use of
keywords as identifiers, which is
useful when interfacing with other
programming languages. The character @
is not actually part of the
identifier, so the identifier might be
seen in other languages as a normal
identifier, without the prefix. An
identifier with an @ prefix is called
a verbatim identifier.

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