Mantra chants are a form of spiritual practice in which a person repeats a phrase or sound to focus their mind and achieve a meditative state. The two crossword solutions for the term 'mantra chants' are OS, which stands for Om Shanti, and OMS, which stands for Om Mani Padme Hum. Om Shanti is a Sanskrit phrase meaning 'peace within' and is often used as a mantra chant in Hinduism and Buddhism. Om Mani Padme Hum is another Sanskrit phrase meaning 'jewel in the lotus' and is a popular mantra chant in Tibetan Buddhism.