Plain English Meaning
HEATT is the name of a specific spot in the sky that pilots and controllers use as a navigation reference point. The name is just a label—pronounceable five-letter codes are assigned to each intersection so they can be spoken clearly on the radio.
Full Definition
A named geographic point along an airway or instrument procedure, identified by the five-letter name 'HEATT,' used as a fix for navigation, clearance routing, or position reporting. Like all named intersections, it is a fixed location defined by latitude and longitude (and historically by the crossing of two VOR radials or other navaid bearings).