Internationalized Resource Identifier

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Internationalized Resource Identifier ( IRI ) is the internationalized form of the Uniform Resource Identifier (URI). They are defined in RFC 3987 . IRIs extend the allowed characters in URIs from a subset of the ASCII character set to almost all characters of the Universal Coded Character Set ( Unicode / ISO 10646).

Web links

RFC 3987
An Introduction to Multilingual Web Addresses , w3.org
URL Percent Encoding and Unicode , Xah Lee, May 24, 2010 (for displaying individual browsers in the address bar)