Bija mantra

A seed mantra; the essence of all other mantras. Thus, of all mantras, they have the most power. The ancient people of India described chakras as having the shape of a lotus flower. At the center of the lotus is a primary energy that is symbolized by a letter in the Sanskrit alphabet. Chanted, this is called a bija mantra. Chanting a bija mantra increases the rotation of the chakra or the frequency of präna moving through the chakra and enhances and heightens its functions.