Pilaster is pronounced, pie-laster, emphasis on pie.

A pilaster is a projecting column built into the face of a wall. It is meant only to give the appearance of a supporting column. It is entirely ornate however, and has no role in the structural integrity of the building.

It's called a pilaster

An anta is a kind of pier produced by thickening a wall at its termination, treated architecturally as a pilaster.

a shallow rectangular feature projecting from a wall having and a base and ususally imitating the form of a colum =)