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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: About "set bits"
Date: Wed, 10 Apr 2013 18:20:29 +0300
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> Date: Wed, 10 Apr 2013 21:46:27 +0800
> From: Xue Fuqiao <xfq.free@gmail.com>
> 
> In (info "(elisp) Bindat Spec"):
> 
>   `bits LEN'
>      List of set bits in LEN bytes.  The bytes are taken in big endian
>      order and the bits are numbered starting with `8 * LEN - 1' and
>      ending with zero.  For example: `bits 2' unpacks `#x28' `#x1c' to
>      `(2 3 4 11 13)' and `#x1c' `#x28' to `(3 5 10 11 12)'.
> 
> I don't know what "set bits" means here.

It means bits that are set, i.e. their value is 1.