Unicode: 03E0. Aliases: Esc Sa Esc, Esc Sampi Esc. Special Greek letter.
Unicode: 03A3. Aliases: Esc S Esc, Esc Sigma Esc. Greek letter. Not the same as \[Sum].
Unicode: 03DA. Aliases: Esc Sti Esc, Stigma Esc. Special Greek letter.
Unicode: 03A4. Aliases: Esc T Esc, Esc Tau Esc. Greek letter. Not the same as English T.
Unicode: 0164. Alias: Esc Tv Esc. Letter. Included in ISO Latin-2.
Unicode: 016E. Alias: Esc Uo Esc. Letter. Included in ISO Latin-1.
Unicode: 017D. Alias: Esc Zv Esc. Letter. Included in ISO Latin-2.
\[Cap]
(Mathematica Character Name) Unicode: 2322. Infix operator. x ⌢ y is by default interpreted as Cap[x,y]. Used in pure mathematics to mean cap product. Sometimes used as an overscript to indicate arc ...
Unicode: 00B8. Alias: Esc cd Esc. Letter-like form. Used in an underscript position as a diacritical mark.
Unicode: 22EF. Letter-like form. Used to indicate omitted elements in a row of a matrix.