ColumnLines is an option for the low-level function GridBox which specifies whether lines should be drawn between adjacent columns.
ColumnsEqual is an option for the low-level function GridBox which specifies whether all columns in the grid should be assigned equal width.
ColumnSpacings is an option for the low-level function GridBox which specifies the spaces in ems that should be inserted between adjacent columns.
CommonDefaultFormatTypes -> {opt_1 -> val_1, opt_2 -> val_2, ...} is an option that specifies default formats for newly created cells.
ComposeList[{f_1, f_2, ...}, x] generates a list of the form {x, f_1[x], f_2[f_1[x]], ...}.
expr_1; expr_2; ... evaluates the expr_i in turn, giving the last one as the result.
Compress[expr] gives a compressed representation of expr as a string.
ContentPadding is an option for objects that can be displayed with frames that specifies whether the vertical margins should shrink wrap tightly around the contents.
Continue[] exits to the nearest enclosing Do, For, or While in a procedural program.
ContinuousAction is an option for Manipulate, Slider, and related functions that specifies whether action should be taken continuously while controls are being moved.