Śrī Vidyā is the name of a Hindu religious system devoted to the goddess Lalitā Tripurasundarī or simply Tripurasundarī (’Beautiful Goddess of the Three Cities’). The Sanskrit word vidyā means knowledge or lore; so the literal translation of Śrī Vidyā is Knowledge of the Goddess Śrī.
In the theology of the Śrī Vidyā the goddess is supreme, transcending the cosmos which is a manifestion of her.
The goddess is worshiped in the form of a mystical diagram (Sanskrit: yantra) of nine intersecting triangles, called the śrīcakra that is the central icon of the tradition.
The name śrīvidyā is also used to refer to a specific mantra used in this tradition having fifteen syllables. This mantra is called the pañcadaśī; The Fifteen syllabled; and the pañcadaśākṣarī. She is also worshiped with a mantra of sixteen syllables called the ṣodaś