Bhuvaneshwari is the Queen (Ishvari) of the phenomenal world (Bhuvan). It is the prime force Parashakti, which manifests herself as the phenomenal world. As a queen, she is interested in the welfare of her subjects and resides in the hearth chakra.
Once Brahma, Vishnu and Shiva quarreled over who was supreme. When the quarrel became too serious, the Divine Mother took them to her abode, where they saw themselves as three women attendants, taking care of creation, preservation and destruction.
Bhavneshwari is one of the ten Mahavidyas - the others are Kali, Tara, Shodashi, Bhairavi, Chinnamasta and Dhumavati, Matangi, Kamala and Bagla Mukhi. The Mahavidyas represent some or other incarnation or manifestation of the Divine Mother. They are in this sense also to be regarded as Vidyas or different approaches to (tantric) knowledge.
Her bija sound is the same as that of Maya. Through the worship of Bhuvaneshwari the divine plan is realized and the illusionary nature of Maya becomes the play of the divine Leela. This brings a deep change in the emotions and in body chemistry. For Bhuvaneshwari worship, the following yantra-mandala can be used :
Bhuvaneshwari Yantra Poster
Bhuvaneshwari Yantra T-Shirts