DownRightVector[x, y, ...] displays as x \[DownRightVector] y \[DownRightVector] ....
DownTeeArrow[x, y, ...] displays as x\[DownTeeArrow]y\[DownTeeArrow]....
EqualTilde[x, y, ...] displays as x \[EqualTilde] y \[EqualTilde] ....
EvaluationCompletionAction is an option for notebooks that specifies the action taken when an evaluation is completed.
ExternalDataCharacterEncoding is a global option that specifies the character encoding used in reading and writing plain text data outside of Mathematica.
FieldHintStyle is an option for InputField that specifies the style to use for displaying the field hint.
FrameBoxOptions -> {opt_1 -> val_1, opt_2 -> val_2, ...} is an option for cells that specifies default settings.
GreaterFullEqual[x, y, ...] displays as x \[GreaterFullEqual] y \[GreaterFullEqual] ....
GreaterGreater[x, y, ...] displays as x \[GreaterGreater] y \[GreaterGreater] ....
GreaterLess[x, y, ...] displays as x \[GreaterLess] y \[GreaterLess] ....