# Z [GstarCAD 2017](Help%20System/GSTARCAD/2017/Index.md) → [System Variables](Help%20System/GSTARCAD/2017/System%20Variables/(System%20Variables).md) ## Topics - [System variable with Z letter](Help%20System/GSTARCAD/2017/System%20Variables/Z/System%20variable%20with%20Z%20letter.md) - [ZOOMFACTOR System Variable](Help%20System/GSTARCAD/2017/System%20Variables/Z/ZOOMFACTOR%20System%20Variable.md) - [ZOOMWHEEL System Variable](Help%20System/GSTARCAD/2017/System%20Variables/Z/ZOOMWHEEL%20System%20Variable.md)