TraceDialog (Built-in Mathematica Symbol)

TraceDialog[expr] initiates a dialog for every expression used in the evaluation of expr. TraceDialog[expr, form] initiates a dialog only for expressions which match form. ...

UnderoverscriptBox (Built-in Mathematica Symbol)

UnderoverscriptBox[x, y, z] is the low-level box representation for x_y^z in notebook expressions.

UnderscriptBox (Built-in Mathematica Symbol)

UnderscriptBox[x, y] is the low-level box representation for UnderscriptBox[x, y] in notebook expressions.

Uninstall (Built-in Mathematica Symbol)

Uninstall[link] terminates an external program started by Install, and removes Mathematica definitions set up by it.

ValueQ (Built-in Mathematica Symbol)

ValueQ[expr] gives True if a value has been defined for expr, and gives False otherwise.

VertexOutComponent (Built-in Mathematica Symbol)

VertexOutComponent[g, {v_1, v_2, ...}] gives the vertices in the graph g that have a directed path from at least one of v_1, v_2, ....VertexOutComponent[g, {v_1, v_2, ...}, ...

VertexRenderingFunction (Built-in Mathematica Symbol)

VertexRenderingFunction is an option for GraphPlot and related functions that gives a function to generate the graphics primitives to use in rendering each vertex.

$BatchInput (Built-in Mathematica Symbol)

$BatchInput is True if input in the current session is being fed directly to the Mathematica kernel in batch mode.

$LicenseID (Built-in Mathematica Symbol)

$LicenseID is a string that gives the license ID under which Mathematica is being run.

$MaxPrecision (Built-in Mathematica Symbol)

$MaxPrecision gives the maximum number of digits of precision to be allowed in arbitrary-precision numbers.