Manual Grouping turns on manual grouping to allow cell grouping by hand.
CharacterEncoding is an option for input and output functions which specifies what raw character encoding should be used.
DefaultAxesStyle is a low-level option for graphics functions that specifies the default style to use in displaying axes and axes-like constructs.
DefaultFrameStyle is a low-level option for graphics and related constructs that specifies the default style to use in displaying their frames.
DefaultStyleDefinitions is a global option that specifies the default stylesheet for all new notebooks.
FontSlant is an option for Style, Cell, and related constructs that specifies how slanted characters in text should be.
FormBoxOptions -> {opt_1 -> val_1, opt_2 -> val_2} is an option for cells that specifies settings for FormBox objects within the cell.
IncludeFileExtension is an option for notebooks that specifies whether the suffix ".nb" is automatically appended to a notebook's name when it is first saved.
LinebreakAdjustments is an option for selections that sets parameters used for calculating where automatic line breaks should be inserted.
PrintAction is an option for notebooks that specifies the action taken when a Print[] command is evaluated by the kernel.