NotPrecedes[x, y, ...] displays as x \[NotPrecedes] y \[NotPrecedes] ....
PlaceholderReplace is an option to Paste that determines whether to replace a selection placeholder with the selected contents.
SquareSubsetEqual[x, y, ...] displays as x \[SquareSubsetEqual] y \[SquareSubsetEqual] ....
SquareSupersetEqual[x, y, ...] displays as x \[SquareSupersetEqual] y \[SquareSupersetEqual] ....
VerticalTilde[x, y, ...] displays as x\[VerticalTilde]y\[VerticalTilde]....
FromCoefficientRules[list, {x_1, x_2, ...}] constructs a polynomial from a list of rules for exponent vectors and coefficients.
$AssertFunction specifies a function to apply to assertions that fail.
$SharedFunctions is the list of functions currently being shared among parallel kernels.
$SharedVariables is the list of variables currently being shared among parallel kernels.
ImageAspectRatio[image] gives the ratio of height to width for image.