>>212561485
it's a sanskrit mantra transliterated into chinese characters
from the scripture 虚空藏菩薩能滿諸願最勝心陀羅尼求聞持法
a very famous mantra in the history of esoteric japanese buddhism which lead 空海 to have visions instructing him to seek out the 大日経 in china

ノウモウ アキャシャガルバヤ
オン アリ キャマリ ムリ ソワカ
namo ākāśagarbhaya
oṃ ārya kamari mauli svāhā

虚空蔵 or Akasagarbha is the great Bodhisattva of the element of empty space
The 虚空蔵菩薩経 describes him as one of the most spiritually accomplished and distinguished of all Bodhisattvas, second only to the Buddhas