Format > Screen Environment (Mathematica Menu Item)

Screen Environment determines which style environment to use for onscreen display.

File > Send To... (Mathematica Menu Item)

Send To launches your email application to email a notebook (Windows only).

Window > Show Ruler (Mathematica Menu Item)

Show Ruler toggles ruler display along the top of a notebook.

Window > Show Toolbar (Mathematica Menu Item)

Show Toolbar toggles toolbar display along the top of a notebook.

Help > Welcome Screen... (Mathematica Menu Item)

Welcome Screen opens the Welcome Screen, which appears by default each time you start Mathematica.

Format > Word Wrapping > Wrap at Paper ... (Mathematica Menu Item)

Wrap at Paper Width wraps lines at the width of the paper currently specified by the print settings.

Format > Word Wrapping >  Wrap at ... (Mathematica Menu Item)

Wrap at Window Width wraps lines at the width of the window containing the text.

ColorSetter (Built-in Mathematica Symbol)

ColorSetter[color] represents a color setter which displays as a swatch of the specified color and when clicked brings up a system color picker ...

Condition (Built-in Mathematica Symbol)

patt /; test is a pattern which matches only if the evaluation of test yields True. lhs :> rhs /; test represents a rule which applies only if the evaluation of test yields ...

ContourLabels (Built-in Mathematica Symbol)

ContourLabels is an option for contour plots that specifies how to label contours.