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.
ForwardBackward is a symbol that represents alternate forward and backward motion or animation.
Forward
(Built-in Mathematica Symbol) Forward is a symbol that represents the forward direction for purposes of motion and animation.
GreaterSlantEqual[x, y, ...] displays as x \[GreaterSlantEqual] y \[GreaterSlantEqual] ....
ImagePad[image, m] pads image on all sides with m background pixels.ImagePad[image, m, padding] pads image on all sides using the value or method specified by ...
LessSlantEqual[x, y, ...] displays as x \[LessSlantEqual] y \[LessSlantEqual] ....
LinkFunction is an option for GeneralizedLinearModelFit that specifies the link function for the generalized linear model.
Minus
(Built-in Mathematica Symbol) -x is the arithmetic negation of x.
NonPositive[x] gives True if x is a non-positive number.