\[DottedSquare] (Mathematica Character Name)

Unicode: F751. Letter-like form.

\[DoubleDagger] (Mathematica Character Name)

Unicode: 2021. Alias: Esc ddg Esc. Letter-like form.

\[DoubleDownArrow] (Mathematica Character Name)

Unicode: 21D3. Infix arrow operator. x ⇓ y is by default interpreted as DoubleDownArrow[x,y]. Extensible character.

\[DoubleStruckA] (Mathematica Character Name)

Unicode: F6E6. Alias: Esc dsa Esc.

\[DoubleStruckB] (Mathematica Character Name)

Unicode: F6E7. Alias: Esc dsb Esc.

\[DoubleStruckCapitalA] (Mathematica Character Name)

Unicode: F7A4. Alias: Esc dsA Esc.

\[DoubleStruckCapitalB] (Mathematica Character Name)

Unicode: F7A5. Alias: Esc dsB Esc.

\[DoubleStruckCapitalC] (Mathematica Character Name)

Unicode: F7A6. Alias: Esc dsC Esc.

\[DoubleStruckCapitalD] (Mathematica Character Name)

Unicode: F7A7. Alias: Esc dsD Esc.

\[DoubleStruckCapitalE] (Mathematica Character Name)

Unicode: F7A8. Alias: Esc dsE Esc.