Stone pillar is a term used to describe a tall, vertical structure made of stone. The most common type of stone pillar is the stele, which is a slab or column of stone that is inscribed with text or art. Stela is another term for a stone pillar, which is usually taller and more slender than a stele. An OBELISK is a tall, four-sided stone pillar that tapers towards a pyramid-like top. All three terms refer to a tall, vertical structure made of stone, and are often used to commemorate an event or person.