Rha (Cyrillic)
Rha is a letter of the Cyrillic script. It looks like a cross-digraph of the Cyrillic letters Er and Kha, but it is not a composable ligature.
Rha was used in the alphabet used in the 1920s for the Moksha language, where it represented the voiceless [alveolar trill], like the rh in Welsh.