Marian columns are religious monuments depicting Virgin Mary on the top, often built in thanksgiving for the ending of a plague or for some other reason. The purpose of the Holy Trinity columns was usually simply to celebrate the church and the faith, though the plague motif could sometimes play its role in their erection as well. Erecting religious monuments in the form of a column surmounted by a figure or a Christian symbol was a gesture of public faith that flourished in the Catholic countries of Europe especially in the 17th and 18th centuries. Thus they became one of the most visible features of Baroque architecture. This usage also influenced some Eastern Orthodox Baroque architecture.

A column or pillar in architecture and structural engineering is a structural element that transmits, through compression, the weight of the structure above to other structural elements below. In other words, a column is a compression member. The term column applies especially to a large round support with a capital and a base or pedestal, which is made of stone, or appearing to be so. A small wooden or metal support is typically called a post. Supports with a rectangular or other non-round section are usually called piers.