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DoubleStruckA ... DoubleStruckZ ... \[DoubleStruckA] ... \[DoubleStruckZ]
Aliases: dsa through dsz. Letters. Treated as distinct characters rather than style modifications of ordinary letters. Contiguous character codes from the private Unicode character range are used, even though a few double-struck characters are included in ordinary Unicode. See The Mathematica Book: Section 3.10.3. See also: \[DoubleStruckCapitalA], \[GothicA], \[ScriptA], etc.