ControllableModelQ[ss] yields True if the StateSpaceModel object ss is controllable, and False otherwise.
CounterAssignments is an option for selections that sets the value of a specified counter.
CounterIncrements is an option for selections that specifies whether the value of a specified counter is incremented by one.
CounterStyleMenuListing is an option for cells that specifies what counter styles are listed in the Counter popup menu of the Create Automatic Numbering Object dialog box.
DefaultNewInlineCellStyle is an option for cells that specifies the default style to use for new inline cells created in the notebook.
DefaultNotebook is a global option that specifies which notebook is used as a template for all new notebooks.
DeletionWarning is an option for InterpretationBox or TagBox objects that specifies whether a warning is issued if the box is deleted.
Depth
(Built-in Mathematica Symbol) Depth[expr] gives the maximum number of indices needed to specify any part of expr, plus 1.
ErrorBoxOptions -> {opt_1 -> val_1, opt_2 -> val_2, ...} applies options and corresponding values.
EvaluationCompletionAction is an option for notebooks that specifies the action taken when an evaluation is completed.