According to a researcher, Nandi on Sengol holds significant cultural and historical value. Here are some points explaining its significance:

• The Nandi on Sengol is inspired by the royal symbol of Nolamba Pallavas, a dynasty that ruled southern India from the 3rd to the 9th century AD.
• The Nandi, a bull, is considered a sacred animal by Hindus and is the mount of Lord Shiva, a principal deity in the religion.
• It is believed that the use of Nandi on Sengol is a representation of the Pallava dynasty's association with Lord Shiva and Hinduism.
• The Nandi on Sengol is a symbol of prosperity, strength, and divine good luck.
• Nandi on Sengol is also used to decorate walls, doorways, and other parts of buildings for spiritual and aesthetic purposes.
• It showcases the Pallava dynasty's mastery in craftsmanship and their inclination towards using art and symbolism in their architecture and culture.
• Furthermore, it showcases the diversity and richness of Indian history and culture, as well as the significance of religious and cultural symbols in Indian society.

In conclusion, the Nandi on Sengol is an important cultural and historical symbol that reflects the Pallava dynasty's association with Lord Shiva and highlights the significance of symbolism and art in Indian culture.