\[DoubleStruckV] (Mathematica Character Name)

Unicode: F6FB. Alias: Esc dsv Esc.

\[DoubleStruckW] (Mathematica Character Name)

Unicode: F6FC. Alias: Esc dsw Esc.

\[DoubleStruckX] (Mathematica Character Name)

Unicode: F6FD. Alias: Esc dsx Esc.

\[DoubleStruckY] (Mathematica Character Name)

Unicode: F6FE. Alias: Esc dsy Esc.

\[DoubleStruckZero] (Mathematica Character Name)

Unicode: F7DB. Alias: Esc ds0 Esc.

\[DoubleStruckZ] (Mathematica Character Name)

Unicode: F6FF. Alias: Esc dsz Esc.

\[DoubleUpArrow] (Mathematica Character Name)

Unicode: 21D1. Infix arrow operator. x ⇑ y is by default interpreted as DoubleUpArrow[x,y]. Extensible character.

\[DoubleUpDownArrow] (Mathematica Character Name)

Unicode: 21D5. Infix arrow operator. x ⇕ y is by default interpreted as DoubleUpDownArrow[x,y]. Extensible character.

\[DoubleVerticalBar] (Mathematica Character Name)

Unicode: 2225. Alias: Esc ␣|| Esc. Infix operator. x ∥ y is by default interpreted as DoubleVerticalBar[x,y]. Used in mathematics to indicate that x exactly divides y. Used ...

\[DownArrowBar] (Mathematica Character Name)

Unicode: 2913. Infix arrow operator. x ⤓ y is by default interpreted as DownArrowBar[x,y]. Sometimes used as an indicator of depth. Extensible character.