The reinforced concrete columns that elevate a building in Le Corbusier's Five Points are called pilotis.
The French term pilotis refers to columns or slender supports that lift a building above the ground. In Le Corbusier's system, the structural frame carries the building's weight, freeing the ground floor for circulation, parking or planting instead of enclosing it with traditional load-bearing walls.
Pilotis were one of five principles presented in Le Corbusier's Five Points of a New Architecture, formulated during the 1920s and published in 1927. The idea depended on modern steel and reinforced-concrete construction, which separated a building's structure from its walls and allowed more flexible planning.
Villa Savoye is the clearest famous example: its white upper floors rest on a regular grid of reinforced-concrete supports. “Columns” is a broad structural description, but pilotis is the canonical architectural term in this historical context. “Piers” and “stilts” may describe other supports, yet neither is the standard answer to this Le Corbusier question.