upana
(also upanam, Tamil: உபானம்) Lowermost part or footing of the basement or adhishthana, projecting beyond the vertical norm and surmounted by the jagati.
It forms the lowermost visible part of the vimana, the uppermost limit of the same being the stupi.
Upanam with inscriptions (Brihadesvara Temple in Thanjavur)
