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该字体称为 blackboard bold（黑板粗体），可使用 \mathbb{} 命令打出。 p.s. \mathbb实际上指的是黑板粗体 (blackboard bold)，在原先的字母基础上多了一些特定的线条，所以有时候也被称为双线体 (double struck)。

Scrappy Mar 30, 2026

Does anyone know a good resource (preferably pictures) that illustrates a conventional way to write the special sets symbols, i.e. In the first post of the thread "cardinal number subtraction", cardinal number subtraction there is a symbol for some kind of set which looks like this: $\\bbb p$ i am familiar.

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Young authors (and some older ones) seem to prefer blackboard bold to plain bold for the standard number systems (and/or they pick it up by osmosis on web sites such as this.