ImageResolution is an option for Export, Rasterize, and related functions that specifies at what resolution bitmap images should be rendered.

Interleaving is an option for Image and related functions that specifies whether data corresponding to different channels in an object such as an image should be interleaved.

Joined is an option for ListPlot and related functions that specifies whether points in each dataset should be joined into a line, or should be plotted as separate points.

Khinchin is Khinchin's constant, with numerical value \[TildeEqual] 2.68545.

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.

MessageList[n] is a global object assigned to be a list of the names of messages generated during the processing of the n\[Null]^th input line.

PackingMethod is an option for GraphPlot and related functions which specifies how disconnected components should be packed together in the layout produced.

RandomChoice[{e_1, e_2, ...}] gives a pseudorandom choice of one of the e_i. RandomChoice[list, n] gives a list of n pseudorandom choices. RandomChoice[list, {n_1, n_2, ...}] ...

RecordSeparators is an option for Read, Find, and related functions that specifies the list of strings to be taken as delimiters for records.