AutoIndent is an option for Style and Cell that specifies what automatic indentation should be done at the beginning of a new line after an explicit return character has been ...
Booleans represents the domain of Booleans, as in x \[Element] Booleans.
BottomHatTransform[image, ker] gives the morphological bottom-hat transform of image with respect to structuring element ker.BottomHatTransform[image, r] gives the bottom-hat ...
BubbleSizes is an option to BubbleChart and related functions that specifies the range of sizes used for bubbles.
ButtonBoxOptions -> {opt_1 -> val_1, opt_2 -> val_2, ...} is an option for cells that specifies settings for buttons within the cell.
ContentSize is an option for Manipulate and other functions that specifies the size of the content area to use.
ControlPlacement is an option for Manipulate, TabView, and other control objects that specifies where controls should be placed.
ConversionRules is an option for Cell that can be set to a list of rules specifying how the contents of the cell are to be converted to external formats.
ExpToTrig[expr] converts exponentials in expr to trigonometric functions.
HelpBrowserSettings -> {opt_1 -> val_1, opt_2 -> val_2, ...} is a global option that specifies settings for the legacy Help Browser.