sikhara
(also sikaram, Tamil: சிகரம்) top-covering of the vimana, above the griva; the crown; of various shapes such as square, bulbous, octagonal and wagon-roof;
Roof of the vimana over the griva, domical or four-sided with a single finial, vaulted with many finials on the ridge or apsidal with many finials over the horizontal part. The entire superstructure (anda) is of northern prasada’s.

Wagon-roof Sikhara on the three-tiered Gopura Sri Rajarajan Tiruvayil (Brihadesvara Temple in Thanjavur)