InitializationCellWarning is an option for notebooks that specifies whether a warning should be given when a notebook containing initialization cells is opened.
UnderscriptBoxOptions -> {opt_1 -> val_1, opt_2 -> val_2, ...} is an option for selections that specifies settings for UnderscriptBox objects.
Grad
(Vector Analysis Package Symbol) Grad[f] gives the gradient, \[Del]f, of the scalar function f in the default coordinate system. Grad[f, coordsys] gives the gradient of f in the coordinate system coordsys.
DiscreteLQEstimatorGains[ss, {w, v}, \[Tau]] gives the optimal discrete-time estimator gain matrix with sampling period \[Tau] for the continuous-time StateSpaceModel object ...
ExposeWidgetReferences is an option to Widget which specifies a list of normally internal \:f3b5children widget reference names to include as publicly available instances.
Vertices[polytope] gives a list of the vertex coordinates of polytope.
FormBox
(Built-in Mathematica Symbol) FormBox[boxes, form] is a low-level box construct which displays as boxes but specifies that rules associated with form should be used to interpret boxes on input.
CapForm
(Built-in Mathematica Symbol) CapForm[type] is a graphics primitive that specifies what type of caps should be used at the ends of lines, tubes, and related primitives.
ConnectedGraphQ[g] yields True if the graph g is connected, and False otherwise.
LoopFreeGraphQ[g] yields True if the graph g has no self-loops, and False otherwise.