PalettePath is a global option that specifies which directories Mathematica searches for palettes on startup.
PixelValue[image, {x, y}] gives the pixel value of image at position {x, y}.PixelValue[image, {x, y}, " type"] gives the pixel value converted to the specified type.
PrintPrecision is an option for selections that specifies the maximum number of digits used for displaying a machine-precision number.
RadicalBoxOptions -> {opt_1 -> val_1, opt_2 -> val_2, ...} is an option for selections that specifies settings for RadicalBox objects.
SampleRate is an option for sound primitives that specifies the number of samples per second to generate for sounds.
Saveable is an option for notebooks that specifies whether a notebook can be saved.
SpanLineThickness is an option for selections that specifies the thickness in printer's points of line-spanning characters such as \[Backslash][VerticalLine] and ...
SpanMaxSize is an option for selections that specifies the maximum size of spanning characters such as parentheses and brackets.
SpanMinSize is an option for selections that specifies the minimum size of spanning characters such as parentheses and brackets.
SpellingDictionariesPath is a global option that specifies which directories are searched for spelling dictionaries when the Edit \[FilledRightTriangle] Check Spelling menu ...