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From: Tobias Burnus <burnus@gmx.de>
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Subject: Re: math set
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Hi Hans,

> In math schoolbooks N Z R and alike are used to denote sets (natural
> numbers and so). Does anyone know where and in what fonts these symbols are
> and how they are called in english?

I used the ones from the AMS font ($\Bbb N$), which is also in Taco's
outline font (except for the vertical mirrored A). Another method is to
use $\bf N$ (usually not $\bi N$) or to use a bold, sans-serif N, Z, Q,
R, C. There are some other alternatives like constructing (IN + \kern),
but those doesn't look that well (especially the C). There are some MF
fonts which provide something which looks more like a CMR letter.

The rule says that this extra lines/strokes in the sets are only used
for blackboards (therefore \Bbb), but shouldn't be used in typesetting
since they are ugly and can be replaced by bold.

I nether the less use usually the AMS symbols.

Tobias