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blackboard bold
Blackboard bold is a typeface style that is often used for certain symbols in mathematical texts, in which certain lines of the symbol (usually vertical or near-vertical lines) are doubled. The symbols usually denote number sets. One way of producing Blackboard bold is to double-strike a character with a small offset on a typewriter.〔 Thus they are referred to as double struck.
== Origin ==
In some texts these symbols are simply shown in bold type: blackboard bold in fact originated from the attempt to write bold letters on blackboards in a way that clearly differentiated them from non-bold letters i.e. by using the edge rather than point of the chalk. It then made its way back in print form as a separate style from ordinary bold,〔(Google Groups )〕 possibly starting with the original 1965 edition of Gunning and Rossi's textbook on complex analysis.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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