The term ATLAS UNIT is composed of three words: MAP (3 letters), ASIA (4 letters), and INSET (5 letters). MAP stands for a representation of a geographical area, usually drawn or printed on a flat surface. ASIA is the world's largest and most populous continent, located primarily in the Eastern and Northern Hemispheres. INSET is a small MAP or diagram inserted into a larger one to show more detail. Together, these three words form the term ATLAS UNIT, which is a unit of measurement used to measure the size of a MAP or chart.