# U [GstarCAD 2027](Help%20System/GSTARCAD/2027/Index.md) ## Topics - [U Command](Help%20System/GSTARCAD/2027/Commands/U/U%20Command.md) - **UCS Command** — [General reference](Help%20System/GSTARCAD/2027/Commands/UCS%20Command.md) · [Alphabetical reference](Help%20System/GSTARCAD/2027/Commands/UCS%20Command.md) - **UCSICON Command** — [General reference](UCSICON%20Command%20%28General%20Reference%29.md) · [Alphabetical reference](Help%20System/GSTARCAD/2027/Commands/UCSICON%20Command.md) - **UCSMAN Command** — [General reference](Help%20System/GSTARCAD/2027/Commands/UCSMAN%20Command.md) · [Alphabetical reference](Help%20System/GSTARCAD/2027/Commands/UCSMAN%20Command.md) - **UNDEFINE Command** — [General reference](Help%20System/GSTARCAD/2027/Commands/UNDEFINE%20Command.md) · [Alphabetical reference](Help%20System/GSTARCAD/2027/Commands/UNDEFINE%20Command.md) - **UNDO Command** — [General reference](Help%20System/GSTARCAD/2027/Commands/UNDO%20Command.md) · [Alphabetical reference](Help%20System/GSTARCAD/2027/Commands/UNDO%20Command.md) - **UNGROUP Command** — [General reference](Help%20System/GSTARCAD/2027/Commands/UNGROUP%20Command.md) · [Alphabetical reference](Help%20System/GSTARCAD/2027/Commands/UNGROUP%20Command.md) - **UNION Command** — [General reference](Help%20System/GSTARCAD/2027/Commands/UNION%20Command.md) · [Alphabetical reference](Help%20System/GSTARCAD/2027/Commands/UNION%20Command.md) - **UNISOLATEOBJECTS Command** — [General reference](Help%20System/GSTARCAD/2027/Commands/UNISOLATEOBJECTS%20Command.md) · [Alphabetical reference](Help%20System/GSTARCAD/2027/Commands/UNISOLATEOBJECTS%20Command.md) - **UNITS Command** — [General reference](UNITS%20Command%20%28General%20Reference%29.md) · [Alphabetical reference](Help%20System/GSTARCAD/2027/Commands/UNITS%20Command.md) - [UNLOCK Command](Help%20System/GSTARCAD/2027/Commands/U/UNLOCK%20Command.md) - **UPDATEFIELD Command** — [General reference](Help%20System/GSTARCAD/2027/Commands/UPDATEFIELD%20Command.md) · [Alphabetical reference](Help%20System/GSTARCAD/2027/Commands/UPDATEFIELD%20Command.md) [Original category](https://www.gstarcad.net/help/GstarCAD_2027_en-US/menu/commandReferences_U.html)