Unicode: F3B1. Alias: Esc cont Esc. Structural element. Used at the end of a line of input to indicate that the expression on that line continues onto the next line. ...
Unicode: 222E. Alias: Esc cint Esc. Compound operator. ∮ f x is by default interpreted as ContourIntegral[f,x].
Unicode: F763. Alias: Esc ctrl Esc. Letter-like form. Representation of the Ctrl key on a keyboard.
Unicode: 2210. Alias: Esc coprod Esc. Infix operator. x ∐ y is by default interpreted as Coproduct[x,y]. ∐ x is by default interpreted as Coproduct[x]. Coproduct is used as ...
Unicode: 224D. Infix similarity operator. x ≍ y is by default interpreted as CupCap[x,y]. Used in mathematics for various notions of equivalence, usually fairly weak. f ≍ g ...
\[Cup]
(Mathematica Character Name) Unicode: 2323. Infix operator. x ⌣ y is by default interpreted as Cup[x,y]. Used in pure mathematics to mean cup product.
Unicode: 03D2. Aliases: Esc cU Esc, Esc cUpsilon Esc. Greek letter. Not commonly used. Used in astronomy for mass to light ratio.
Unicode: 03B5. Aliases: Esc ce Esc, Esc cepsilon Esc. Greek letter. Not the same as \[Element]. Used in physics for Fermi energy and dielectric constant.
Unicode: 03F0. Aliases: Esc ck Esc, Esc ckappa Esc. Greek letter.
Unicode: 03D6. Aliases: Esc cp Esc, Esc cpi Esc. Greek letter. Not commonly used, except in astronomy.