PageWidth is an option for output streams and for cells which specifies how wide each line of text should be allowed to be.
PrivateEvaluationOptions -> {opt_1 -> val_1, opt_2 -> val_2} is an option for selections that specifies settings for evaluation-related suboptions.
RasterSize is an option for Rasterize and related functions that determines the absolute pixel size of the raster generated.
Residue
(Built-in Mathematica Symbol) Residue[expr, {z, z_0}] finds the residue of expr at the point z = z_0.
Switch
(Built-in Mathematica Symbol) Switch[expr, form_1, value_1, form_2, value_2, ...] evaluates expr, then compares it with each of the form_i in turn, evaluating and returning the value_i corresponding to ...
TraceScan[f, expr] applies f to all expressions used in the evaluation of expr. TraceScan[f, expr, form] includes only those expressions which match form. TraceScan[f, expr, ...
Verbatim[expr] represents expr in pattern matching, requiring that expr be matched exactly as it appears, with no substitutions for blanks or other transformations.
VertexLabelStyle is an option and property for Graph and related functions that specifies the style to use for vertex labels.
ViewCenter is an option for Graphics3D and related functions which gives the scaled coordinates of the point which should appear at the center of the final image.
$ConfiguredKernels is the default list of kernels that are configured to be launched for parallel computing.