AnimationRepetitions is an option to Animate and related functions that specifies how many times the animation they create runs before stopping.
AppearanceElements is an option for functions like Manipulate that specifies what elements should be included in the displayed form of the object generated.
AutoAction is an option for objects such as Slider, Locator, and Button that specifies whether they should automatically take action whenever the mouse pointer is over them, ...
AutoDelete is an option for boxes that specifies whether a box is automatically deleted when its contents are edited.
AutoItalicWords is an option for Cell that gives a list of words that should automatically be put in italics when they are entered.
Automatic represents an option or other value that is to be chosen automatically by a built-in function.
AutoSpacing is an option for Style and Cell that specifies whether spaces between successive characters should be adjusted automatically.
Baseline is a symbol that represents the baseline for purposes of alignment and positioning.
Bottom
(Built-in Mathematica Symbol) Bottom is a symbol that represents the bottom for purposes of alignment and positioning.
CellChangeTimes is an option to Cell that specifies when changes were made to the cell.