# U Command [GstarCAD 2020](Help%20System/GSTARCAD/2020/Index.md) → [Commands](Help%20System/GSTARCAD/2020/Commands/(Commands).md) → [U](Help%20System/GSTARCAD/2020/Commands/U/(U).md) - [U](Help%20System/GSTARCAD/2020/Commands/U/U%20Command--2348e95aa3df.md "U") - [UCS](Help%20System/GSTARCAD/2020/Commands/U/UCS%20Command--0279b98a57ea.md "UCS") - [UCSICON](Help%20System/GSTARCAD/2020/Commands/U/UCSICON%20Command--ab08dbc91934.md "UCSICON") - [UCSMAN](Help%20System/GSTARCAD/2020/Commands/U/UCAMAN--d5cf3c75c60f.md "UCSMAN") - [UNDEFINE](Help%20System/GSTARCAD/2020/Commands/U/UNDEFINE%20Command--a449a7f71c52.md "UNDEFINE") - [UNDO](Help%20System/GSTARCAD/2020/Commands/U/UNDO%20Command--ee547dd5d3cd.md "UNDO") - [UNION](Help%20System/GSTARCAD/2020/Commands/U/UNION%20Command--b3d4835593ad.md "UNION") - [UNISOLATEOBJECTS](Help%20System/GSTARCAD/2020/Commands/U/UNISOLATEOBJECTS%20Command--96c159ff54e1.md "UNISOLATEOBJECTS") - [UNITS](Help%20System/GSTARCAD/2020/Commands/U/UNITS%20Command--e6b66b89e9b4.md "UNITS") - [UPDATEFIELD](Help%20System/GSTARCAD/2020/Commands/U/UPDATEFIELD%20Command--ee7a372acb0d.md "UPDATEFIELD") ---