A finial is the "crowning decoration of a dome." 1 Humayun's Tomb's dome's finial's 18-foot tall gilded form is made of brass around a wooden core.2 Its design is comprised of stacked disc shapes alternated with pot shapes underneath a shahada inscription.
1. Margaret S. Graves and Benoît Junod, eds., Architecture in Islamic Arts: Treasures of the Aga Khan Museum (Geneva: Aga Khan Trust for Culture, 2011), 350.
2. "Finial," Nizamuddin Urban Renewal Initiative, accessed May 20, 2020, http://www.nizamuddinrenewal.org/conservation/humayun-tomb/data/finial.php.
Hillenbrand, Robert. "Splendour and Austerity: Islamic Architectural Ornament." Annual Halt, no.2 (1995): 8-27.
Aga Khan Development Network. "Humayun's Tomb Finial."
Nizamuddin Urban Renewal Initiative. "Finial."