What term pertains to the navel?

The term that pertains to the navel is "umbilical." This terminology is derived from "umbilicus," which is the medical term for the navel or belly button. The umbilical region is the area of the abdomen surrounding the navel, and conditions or procedures associated with this area often use the prefix "umbilical" to indicate their specific relationship to the navel itself.

In contrast, the other terms refer to different regions of the abdomen. Epigastric pertains to the upper central region of the abdomen, iliac refers to the lower lateral regions, and hypogastric relates to the lower central region below the umbilicus. Each of these terms denotes specific anatomical areas, making "umbilical" the correct choice for anything specifically related to the navel.