The intrusive igneous rock body that is tabular and concordant is called a sill.

Here's why:

* Tabular: This means the rock body is flat and sheet-like.

* Concordant: This means the rock body is parallel to the existing layers (strata) of the surrounding rock.

Sills are formed when magma intrudes between existing layers of rock, pushing them apart. They often cool slowly, allowing for the formation of large crystals, making them recognizable in the field.

Let me know if you have any other questions about intrusive igneous rocks!