Level
(Built-in Mathematica Symbol) Level[expr, levelspec] gives a list of all subexpressions of expr on levels specified by levelspec. Level[expr, levelspec, f] applies f to the sequence of subexpressions.
The ability to define and use your own functions is part of what gives Mathematica such power. It is often inconvenient to have to explicitly name a function for every small ...
"FindNextMisspelling" is a front end token that selects the next misspelled word and opens the Check Spelling dialog.
Background Color assigns a background color to the selected cells or text.
Size assigns a point size to selected cells or text.
EvaluationCompletionAction is an option for notebooks that specifies the action taken when an evaluation is completed.
OrderedQ[h[e_1, e_2, ...]] gives True if the e_i are in canonical order, and False otherwise.
PageFooterLines is an option for notebooks that specifies whether a horizontal line is inserted at the bottom of each page when the notebook is printed.
PageHeaderLines is an option for notebooks that specifies whether a horizontal line is inserted at the top of each page when the notebook is printed.
WindowFrameElements is an option for notebooks that specifies the elements to include in the frame of the window used to display the notebook on the screen.