The full form of QGIS in geography is Quantum Geographic Information System.
QGIS is a free and open-source Geographic Information System (GIS) application. It allows users to create, view, edit, analyze, and publish geospatial information. It's widely used in various fields, including geography, environmental science, urban planning, and more. The "Quantum" part of the name reflects its origins, though its current functionality extends well beyond the initial design. QGIS provides a robust platform for working with spatial data without the cost associated with proprietary GIS software.