Unicode: 2289. Alias: Esc !sup= Esc. Infix set relation operator. x ⊉ y is by default interpreted as NotSupersetEqual[x,y].
Unicode: 2285. Alias: Esc !sup Esc. Infix set relation operator. x ⊅ y is by default interpreted as NotSuperset[x,y].
Unicode: 2244. Alias: Esc !~= Esc. Infix similarity operator. x ≄ y is by default interpreted as NotTildeEqual[x,y].
Unicode: 2247. Alias: Esc !~== Esc. Infix similarity operator. x ≇ y is by default interpreted as NotTildeFullEqual[x,y].
Unicode: 2241. Alias: Esc !~ Esc. Infix similarity operator. x ≁ y is by default interpreted as NotTilde[x,y].
Unicode: 2249. Alias: Esc !~~ Esc. Infix similarity operator. x ≉ y is by default interpreted as NotTildeTilde[x,y].
Unicode: 2224. Alias: Esc !| Esc. Infix operator. x y is by default interpreted as NotVerticalBar[x,y]. Used in mathematics to mean x does not divide y.
Unicode: 00F1. Alias: Esc n~ Esc. Letter. Included in ISO Latin-1.
\[Null]
(Mathematica Character Name) Unicode: F3A0. Alias: Esc null Esc. Letter-like form. Can be used to place subscripts and superscripts without having a visible base.
Unicode: 00F6. Alias: Esc o" Esc. Letter. Included in ISO Latin-1.