Monolithic column
Encyclopedia
A monolithic column is a column
Column
A column or pillar in architecture and structural engineering is a vertical structural element that transmits, through compression, the weight of the structure above to other structural elements below. For the purpose of wind or earthquake engineering, columns may be designed to resist lateral forces...

of which the shaft is made from one single piece of stone instead of different sections.

They are sometimes called 'single-piece columns' and were most likely used on ancient temples.
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