Unicode: 2234. Alias: Esc tf Esc. Infix operator. x ∴ y is by default interpreted as Therefore[x,y]. x ∴ y ∴ z groups as x ∴ (y ∴ z).
Unicode: 2005. Alias: Esc ␣␣ ␣␣ Esc. Spacing character. Width: 5/18 em. Interpreted by default just like an ordinary \[RawSpace].
Unicode: F3C7. Alias: Esc tr Esc. Superscript postfix operator with built-in evaluation rules. m^ is by default interpreted as Transpose[m]. Not the same as keyboard T.
Unicode: 016F. Alias: Esc uo Esc. Letter. Included in ISO Latin-1.
\[Zeta]
(Mathematica Character Name) Unicode: 03B6. Aliases: Esc z Esc, Esc zeta Esc. Greek letter. Used in TraditionalForm for Zeta and WeierstrassZeta.
HaradaNortonGroupHN[] represents the sporadic simple Harada\[Dash]Norton group HN.
ImageColorSpace[image] gives the name of the color space of image.
LyonsGroupLy[] represents the sporadic simple Lyons group Ly.
MonsterGroupM[] represents the sporadic simple monster group M.
ONanGroupON[] represents the sporadic simple O'Nan group O' N.