NotTildeEqual[x, y, ...] displays as x \[NotTildeEqual] y \[NotTildeEqual] ....
NotTildeFullEqual[x, y, ...] displays as x \[NotTildeFullEqual] y \[NotTildeFullEqual] ....
NotTilde[x, y, ...] displays as x \[NotTilde] y \[NotTilde] ....
NotTildeTilde[x, y, ...] displays as x \[NotTildeTilde] y \[NotTildeTilde] ....
NotVerticalBar[x, y, ...] displays as x \[NotVerticalBar] y \[NotVerticalBar] ....
OptionsPattern[] is a pattern object that represents a collection of options given as rules, where the values of the options can be accessed using OptionValue. ...
Orange
(Built-in Mathematica Symbol) Orange represents the color orange in graphics or style specifications.
PageFooterLines is an option for notebooks that specifies whether a horizontal line is inserted at the bottom of each page when the notebook is printed.
PageHeaderLines is an option for notebooks that specifies whether a horizontal line is inserted at the top of each page when the notebook is printed.
PalettePath is a global option that specifies which directories Mathematica searches for palettes on startup.