FlattenAt[list, n] flattens out a sublist that appears as the n\[Null] th element of list. If n is negative, the position is counted from the end. FlattenAt[expr, {i, j, ...
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.
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.
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.
MaxPlotPoints is an option for plotting functions like ArrayPlot and ListPlot3D that specifies the maximum number of points that will explicitly be included in the output.
MemoryInUse[] gives the number of bytes currently being used to store all data in the current Mathematica kernel session. MemoryInUse[$FrontEnd] gives the number of bytes ...
Mod
(Built-in Mathematica Symbol) Mod[m, n] gives the remainder on division of m by n. Mod[m, n, d] uses an offset d.