Unicode: 227C. Infix ordering operator. x ≼ y is by default interpreted as PrecedesSlantEqual[x,y].
Unicode: 227E. Infix ordering operator. x ≾ y is by default interpreted as PrecedesTilde[x,y].
Unicode: 2032. Alias: Esc ' Esc. Letter-like form. Used to indicate angles in minutes or distances in feet. Used in an overscript position as an acute accent.
Unicode: 220F. Alias: Esc prod Esc. Compound operator with built-in evaluation rules. ∏_(i)^i_max(f) is by default interpreted as Product[f,{i,i_max}]. ∏_(i=i_min)^i_max(f) ...
Unicode: 221D. Alias: Esc prop Esc. Infix relational operator. x ∝ y is by default interpreted as Proportional[x,y]. Not the same as \[Alpha].
Unicode: 2237. Infix relational operator. x ∷ y is by default interpreted as Proportion[x,y]. Used historically to indicate equality; now used to indicate proportion.
\[Psi]
(Mathematica Character Name) Unicode: 03C8. Aliases: Esc ps Esc, Esc psi Esc, Esc y Esc. Greek letter. Used in TraditionalForm for PolyGamma.
Unicode: 2669.
Unicode: 0026. Raw operator. Equivalent to the ordinary ASCII character with code 38.
Unicode: 0040. Raw operator. Equivalent to the ordinary ASCII character with code 64.