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Rha (Ԗ ԗ; italics: Ԗ ԗ) is a letter of the Cyrillic script. It looks like a cross-digraph of the Cyrillic letters Er (Р р) and Kha (Х х), but it is not a composable ligature.
Rha was used in the alphabet of the Moksha language, where it represented the voiceless alveolar trill /r̥/.
References
Rha (Cyrillic) Wikipedia(Text) CC BY-SA