TransitionProbability[element] gives a list of {wavelength_v, prob} pairs, where wavelength_v is the wavelength in vacuum and prob is the spontaneous transition probability ...
The control mechanisms set up for NDSolve enable you to define your own numerical integration algorithms and use them as specifications for the Method option of NDSolve. ...
TetGenGetNeighbors[expr] gets the neighbors in a TetGen expression.
FeedbackType is an option for some control system functions that specifies the feedback type.
LegendAppearance is an option for charting functions that specifies the appearance of any legends that are generated.
ConversionRules is an option for Cell that can be set to a list of rules specifying how the contents of the cell are to be converted to external formats.
PalettePath is a global option that specifies which directories Mathematica searches for palettes on startup.
StyleSheetPath is a global option that specifies which directories Mathematica searches to find stylesheets.
Mouseover[expr, over] represents an object that displays as over when the mouse pointer is over it, and as expr otherwise.