How can you tell that this is a doric column?

A Doric column can be identified by its simple and sturdy design, characterized by a fluted shaft that typically has 20 concave grooves. It features a plain capital, without elaborate decorations, and rests directly on the stylobate without a base. The overall proportions are more robust compared to other column orders, such as Ionic or Corinthian, reflecting a sense of strength and functionality typical of Classical Greek architecture.