The Chinese Translation is 真言; zhenyan; 'accurate terms', the Japanese on'yomi reading from the Chinese being shingon (which can be also applied as the appropriate identify for your Shingon sect). Cundī dhāraṇī or mantra also to start with appeared in the Kāraṇḍavyūhasūtra: namaḥ saptānāṃ samyaksaṃbuddha koṭīnāṃ tadyathā oṃ cale cule https://www.youtube.com/watch?v=7yoEpl90KUg