ContinuousTimeModelQ[expr] gives True if expr is a continuous-time StateSpaceModel or TransferFunctionModel object, and False otherwise.
DefaultElement is an option for Grid and related constructs which specifies what to insert when a new element is interactively created.
EvaluationElements is an option for NotebookEvaluate that determines which cells to evaluate.
Label
(Built-in Mathematica Symbol) Label[tag] represents a point in a compound expression to which control can be transferred using Goto.
MorphologicalBranchPoints[image] gives a version of a binary image image in which white pixels represent the morphological branch points.
PixelConstrained is an option for ArrayPlot which specifies how to constrain cells to align with displayed pixels.
RawBoxes[boxes] is a low-level construct which is formatted as boxes without further interpretation.
RawData
(Built-in Mathematica Symbol) RawData[data] is a low-level representation of the contents of a cell in which Show Cell Expression has been toggled.
RefreshRate is an option to Animate and related functions which specifies the refresh rate for frames in animations.
SystemHelpPath is a global option that specifies which directories are searched for the help notebooks used within the help system.