Final answer:
Engaged columns are the columns found between the foundation walls in a crawl space used to support the floor joists.
Step-by-step explanation:
The columns, typically made of masonry block, found between the foundation walls in a crawl space and used to support the floor joists are called engaged columns. Engaged columns are not free-standing but become part of the wall they support. They are commonly used in the Classical orders of architecture and are integrated into the wall structure.