A diacritical mark which indicates an orthographic ‘r’ (repha) in some words borrowed from Sanskrit (in Devanagari, repha appears as the eyelash mark above र्क, or rka). It originally represented an /r/ sound that preceded the base consonant, but in Khmer, in most cases, the consonant above which it appears, and the diacritic itself, are not pronounced. See also របាទ(rɔbaat).