FrameBox[box] is a low-level box construct which represents box with a frame drawn around it.
GeoDestination[pos, {d, \[Alpha]}] gives the geodetic position reached by going distance d in azimuthal direction \[Alpha] from pos.
Gradient is an option for FindMinimum and related functions that specifies the gradient vector to assume for the function being extremized.
GroupPageBreakWithin is an option for Cell that specifies whether a page break should be allowed within the group of cells if the notebook that contains the group is printed.
HexadecimalCharacter represents a hexadecimal digit character 0\[Dash]9, a\[Dash]f, A\[Dash]F in StringExpression.
Identity[expr] gives expr (the identity operation).
ImageReflect[image] reverses image by top-bottom mirror reflection. ImageReflect[image, side] reverses image by reflecting it so that the specified side goes to the opposite ...
Legended[expr, lbl] indicates that a legend entry for expr should be created, with label lbl.
LinkObject["name", n_1, n_2] is an object that represents an active MathLink connection for functions such as LinkRead and LinkWrite.
Manipulator[x] represents a manipulator with setting x in the range 0 to 1. Manipulator[Dynamic[x]] takes the setting to be the dynamically updated current value of x, with ...