The Arrow dimension can be used to indicate the value of an assigned feature by drawing an arrow pointing out of the point.
Articles for Mapping
Pulsation can be used to highlight a particular category by making points in that category grow larger and smaller repeatedly.
Halo can be used to highlight a particular category by circling points in that category with rings.
Playback is a useful dimension for both selecting different categories inside a feature and also for animating a data set.
Dragging features to the Mapping panel will change the position and appearance of the plotted points depending on the new dimensions used.
Transparency is a useful dimension for attracting the viewer's attention toward certain points and away from other points.
The Group By dimension is useful for categorical features with a large number of unique categories. It is also used by Line Plots to build a line for each category.
Color is the most important Appearance dimension and can be used in all Plot Types. This dimension will change the color of your points, bin, and surfaces to represent the value of that object for the assigned feature.
Size is a very useful dimension for attracting the viewer's attention toward certain points and away from other points. Size is an easy dimension for people to process and grasp, even when other dimensions are being used.
Shape changes the shape of each point to represent that point's value or category for the assigned feature.
The four Extra dimensions, Transparency, Halo, Pulsation and Arrow, are best-suited to specific use cases.
The two Refine dimensions, Group By and Playback, do not change the appearance of the dataset, but are useful for organizing, filtering, and animating the visualization.