Direction is an option for Limit that specifies the direction in which the limit is taken.
DynamicEvaluationTimeout is an option for displayed objects, cells, and notebooks that specifies the timeout in seconds for any Dynamic computations they contain.
Editable is an option for displayed objects, cells, and notebooks that specifies whether their contents can be edited interactively using the front end.
Evaluatable is an option for Cell that specifies whether a cell should be used as input to be evaluated by the Mathematica kernel.
ImageRegion is an option for cells that specifies the size and position of the bounding box within which a graphic is rendered.
Manipulator[x] represents a manipulator with setting x in the range 0 to 1. Manipulator[Dynamic[x]] takes the setting to be the dynamically updated current value of x, with ...
NumberPadding is an option for NumberForm and related functions which gives strings to use as padding on the left- and right-hand sides of numbers.
Overlaps is an option to StringCases, StringCount, and StringPosition that specifies how to treat overlapping substrings.
ResetDirectory[] resets the current working directory to its previous value.
Selectable is an option for displayed objects, cells, and notebooks that specifies whether their contents can be selected interactively using the front end.