The IAST reference article from the English Wikipedia on 24-Apr-2004
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IAST

International Alphabet of Sanskrit Transliteration (IAST) is mainly used in printed publications, like books and magazines. Only recently it became available in online resources, such as web-pages.

Examples: Ā ā Ī ī Ū ū Ṃ ṃ, Ṁ ṁ Ṅ ṅ, Ṇ ṇ Ṛ ṛ, Ṙ ṙ, Ṝ ṝ Ḹ ḹ