NotebooksMenu is a global option that specifies which recently opened notebooks are listed under the File menu.

Plain represents a font that is not bold, italic, or underlined.

Postfix[f[expr]] prints with f[expr] given in default postfix form: expr // f. Postfix[f[expr], h] prints as exprh.

Prefix[f[expr]] prints with f[expr] given in default prefix form: f@expr. Prefix[f[expr], h] prints as hexpr.

PrintPrecision is an option for selections that specifies the maximum number of digits used for displaying a machine-precision number.

RawData[data] is a low-level representation of the contents of a cell in which Show Cell Expression has been toggled.

Scrollbars is an option for Pane that specifies whether scrollbars should be displayed.

StartingStepSize is an option to NDSolve and related functions that specifies the initial step size to use in trying to generate results.

UndirectedEdge[u, v] or u \[UndirectedEdge] v represents an undirected edge of a graph with vertices u and v.

VertexSize is an option and property for Graph and related functions that specifies the size used for vertices.