| UC | Language.Drasil |
| uc | Language.Drasil |
| uc' | Language.Drasil |
| UCsSec | Drasil.DocLang, Drasil.SRSDocument |
| ucStaged | Language.Drasil |
| ucStaged' | Language.Drasil |
| UD | Language.Drasil |
| UFunc | Language.Drasil.ModelExpr.Development, Language.Drasil.Expr.Development, Drasil.Code.CodeExpr.Development |
| UFuncB | Language.Drasil.ModelExpr.Development, Language.Drasil.Expr.Development, Drasil.Code.CodeExpr.Development |
| UFuncVN | Language.Drasil.ModelExpr.Development, Language.Drasil.Expr.Development, Drasil.Code.CodeExpr.Development |
| UFuncVV | Language.Drasil.ModelExpr.Development, Language.Drasil.Expr.Development, Drasil.Code.CodeExpr.Development |
| UID | Drasil.Database |
| uid | Drasil.Database |
| UIDRef | Drasil.Database |
| UlC | Language.Drasil |
| ulcc | Language.Drasil |
| UnaryOp | |
| 1 (Data Constructor) | Language.Drasil.Expr.Development |
| 2 (Data Constructor) | Language.Drasil.ModelExpr.Development |
| 3 (Data Constructor) | Drasil.Code.CodeExpr.Development |
| UnaryOpB | |
| 1 (Data Constructor) | Language.Drasil.Expr.Development |
| 2 (Data Constructor) | Language.Drasil.ModelExpr.Development |
| 3 (Data Constructor) | Drasil.Code.CodeExpr.Development |
| UnaryOpVN | |
| 1 (Data Constructor) | Language.Drasil.Expr.Development |
| 2 (Data Constructor) | Language.Drasil.ModelExpr.Development |
| 3 (Data Constructor) | Drasil.Code.CodeExpr.Development |
| UnaryOpVV | |
| 1 (Data Constructor) | Language.Drasil.Expr.Development |
| 2 (Data Constructor) | Language.Drasil.ModelExpr.Development |
| 3 (Data Constructor) | Drasil.Code.CodeExpr.Development |
| Unbundled | Language.Drasil.Code |
| unc | Language.Drasil |
| Uncertainty | Language.Drasil |
| uncertainty | Data.Drasil.Concepts.Documentation, Drasil.Metadata.Documentation |
| uncertCol | Data.Drasil.Concepts.Documentation |
| UncertQ | Language.Drasil |
| unChunk | Drasil.Database |
| unCI | |
| 1 (Function) | Drasil.GProc |
| 2 (Function) | Drasil.GOOL |
| unCPPC | Drasil.GOOL |
| unCPPP | Language.Drasil.GOOL |
| uncPrec | Language.Drasil |
| unCSC | Drasil.GOOL |
| unCSP | Language.Drasil.GOOL |
| uncty | Language.Drasil |
| uncVal | Language.Drasil |
| underConsidertn | Drasil.Sentence.Combinators |
| undergradDegree | Data.Drasil.Concepts.Education |
| undergraduate | Data.Drasil.Concepts.Education |
| understandability | Data.Drasil.Concepts.Software |
| unhide | Drasil.Database |
| unhideOrErr | Drasil.Database |
| unhideUni | Drasil.Database |
| unhideUniOrErr | Drasil.Database |
| unicodeConv | Language.Drasil |
| UnitalChunk | Language.Drasil |
| unitCon | Language.Drasil |
| UnitDefn | Language.Drasil |
| unitDoc | Language.Drasil.Printers |
| Units | Drasil.DocLang, Drasil.SRSDocument |
| unitTableRef | Drasil.DocLang |
| unitV | Data.Drasil.Concepts.Math |
| unitVect | Data.Drasil.Quantities.Math |
| unitVectj | Data.Drasil.Quantities.Math |
| unitWrapper | Language.Drasil |
| UnitypedUIDRef | Drasil.Database |
| unit_ | Data.Drasil.Concepts.Math, Drasil.Metadata.Concepts.Math |
| unJC | Drasil.GOOL |
| unJLC | Drasil.GProc |
| unJLP | Language.Drasil.GOOL |
| unJP | Language.Drasil.GOOL |
| unknownVect | Theory.Drasil |
| UnlabelledContent | Language.Drasil |
| UnlblC | Language.Drasil |
| unlbldCode | Drasil.Document.Contents |
| unlbldExpr | Drasil.Document.Contents |
| unlikeChg | Drasil.DocLang.SRS |
| unlikeChgDom | Data.Drasil.Concepts.Documentation, Drasil.Metadata.Documentation |
| unlikeChgLabel | Drasil.DocLang.SRS |
| unlikelyChg | Data.Drasil.Concepts.Documentation, Drasil.Metadata.Documentation |
| Unmodular | Language.Drasil.Code |
| unnamedParam | Language.Drasil.Code |
| unnamedParamFill | Language.Drasil.Code |
| unnamedParamPBVFill | Language.Drasil.Code |
| uNormalVect | Data.Drasil.Quantities.Math |
| unPC | Drasil.GOOL |
| unPP | Language.Drasil.GOOL |
| Unpublished | Language.Drasil |
| unReprDoc | Language.Drasil.GOOL |
| unSC | Drasil.GOOL |
| unSP | Language.Drasil.GOOL |
| unsupOS | Language.Drasil.Printers |
| unwrap | Drasil.Sentence.Combinators |
| UpFrom | Language.Drasil |
| Upper | Language.Drasil |
| upperLeft | Language.Drasil |
| UpTo | Language.Drasil |
| uq | Language.Drasil |
| uqc | Language.Drasil |
| uqcND | Language.Drasil |
| URI | Language.Drasil |
| URL | Language.Drasil |
| US | Language.Drasil |
| useCase | Data.Drasil.Concepts.Documentation, Drasil.Metadata.Documentation |
| useCaseTable | Data.Drasil.Concepts.Documentation |
| useCaseTableLabel | Drasil.DocLang.SRS |
| UsePackages | |
| 1 (Type/Class) | Drasil.Generator |
| 2 (Data Constructor) | Drasil.Generator |
| user | Data.Drasil.Concepts.Documentation, Drasil.Metadata.Documentation |
| userChar | Drasil.DocLang.SRS |
| userCharacteristic | Data.Drasil.Concepts.Documentation, Drasil.Metadata.Documentation |
| userCharsLabel | Drasil.DocLang.SRS |
| UserDefined | Language.Drasil.Code |
| UserDefinedArgF | Language.Drasil.Code |
| userDefinedArgFill | Language.Drasil.Code |
| userDefinedParamFill | Language.Drasil.Code |
| userInput | Data.Drasil.Concepts.Documentation |
| UsrChars | Drasil.DocLang, Drasil.SRSDocument |
| USymb | Language.Drasil |
| usymb | Language.Drasil |