used in 般若[bo1 re3]; used in 蘭若|兰若[lan2 re3]
Pictograph of a kneeling person smoothing out their unkempt hair with their hands. Based on the original meaning "conform, obey". The 口 (mouth) component was added later when the character became more abstract.
《說文》：“若，擇菜也。从艸、右。右，手也。一曰杜若，香艸。”
conform, obey