# System variable with Z letter [GstarCAD 2021](Help%20System/GSTARCAD/2021/Index.md) → [System Variables](Help%20System/GSTARCAD/2021/System%20Variables/(System%20Variables).md) → [Z](Help%20System/GSTARCAD/2021/System%20Variables/Z/(Z).md) - [ZOOMFACTOR](Help%20System/GSTARCAD/2021/System%20Variables/Z/ZOOMFACTOR%20System%20Variable.md "ZOOMFACTOR") - [ZOOMWHEEL](Help%20System/GSTARCAD/2021/System%20Variables/Z/ZOOMWHEEL%20System%20Variable.md "ZOOMWHEEL") ---