# U [GstarCAD 2018](Help%20System/GSTARCAD/2018/Index.md) → [System Variables](Help%20System/GSTARCAD/2018/System%20Variables/(System%20Variables).md) ## Topics - [System variable with U letter](Help%20System/GSTARCAD/2018/System%20Variables/U/System%20variable%20with%20U%20letter.md) - [UCSAXISANG System Variable](Help%20System/GSTARCAD/2018/System%20Variables/U/UCSAXISANG%20System%20Variable.md) - [UCSBASE System Variable](Help%20System/GSTARCAD/2018/System%20Variables/U/UCSBASE%20System%20Variable.md) - [UCSDETECT System Variable](Help%20System/GSTARCAD/2018/System%20Variables/U/UCSDETECT%20System%20Variable.md) - [UCSFOLLOW System Variable](Help%20System/GSTARCAD/2018/System%20Variables/U/UCSFOLLOW%20System%20Variable.md) - [UCSICON System Variable](Help%20System/GSTARCAD/2018/System%20Variables/U/UCSICON%20System%20Variable.md) - [UCSNAME System Variable](Help%20System/GSTARCAD/2018/System%20Variables/U/UCSNAME%20System%20Variable.md) - [UCSORG System Variable](Help%20System/GSTARCAD/2018/System%20Variables/U/UCSORG%20System%20Variable.md) - [UCSORTHO System Variable](Help%20System/GSTARCAD/2018/System%20Variables/U/UCSORTHO%20System%20Variable.md) - [UCSVIEW System Variable](Help%20System/GSTARCAD/2018/System%20Variables/U/UCSVIEW%20System%20Variable.md) - [UCSVP System Variable](Help%20System/GSTARCAD/2018/System%20Variables/U/UCSVP%20System%20Variable.md) - [UCSXDIR System Variable](Help%20System/GSTARCAD/2018/System%20Variables/U/UCSXDIR%20System%20Variable.md) - [UCSYDIR System Variable](Help%20System/GSTARCAD/2018/System%20Variables/U/UCSYDIR%20System%20Variable.md) - [UNDOCTL System Variable](Help%20System/GSTARCAD/2018/System%20Variables/U/UNDOCTL%20System%20Variable.md) - [UNDOMARKS System Variable](Help%20System/GSTARCAD/2018/System%20Variables/U/UNDOMARKS%20System%20Variable.md) - [UNITMODE System Variable](Help%20System/GSTARCAD/2018/System%20Variables/U/UNITMODE%20System%20Variable.md) - [UOSNAP System Variable](Help%20System/GSTARCAD/2018/System%20Variables/U/UOSNAP%20System%20Variable.md) - [UPDATETHUMBNAIL System Variable](Help%20System/GSTARCAD/2018/System%20Variables/U/UPDATETHUMBNAIL%20System%20Variable.md) - [USERI1-USERI5 System Variable](Help%20System/GSTARCAD/2018/System%20Variables/U/USERI1-USERI5%20System%20Variable.md) - [USERR1-USERR5 System Variable](Help%20System/GSTARCAD/2018/System%20Variables/U/USERR1-USERR5%20System%20Variable.md) - [USERS1-USERS5 System Variable](Help%20System/GSTARCAD/2018/System%20Variables/U/USERS1-USERS5%20System%20Variable.md)