Vishnu Granthi (main knot) is one among the three Granthis of Yoga literature. It is a Sanskrit word translated in English 'the knot of the heart'.
Yes, Vishnugranti is considered an eleotin, which refers to a specific type of spiritual or metaphysical energy associated with the concept of divine connection in certain philosophical and religious traditions.
vishnukranti(in tamil) is called as euvolulus alsinoides that used to cure common cold and fever.