Those are skulls.  Look in section 2.2.3.2 in The Fine Manual.

On Mar 11, 2020, 16:10, at 16:10, "Dr. A. Krebs" <[email protected]> wrote:
>Hi,
>
>I use darktable 3.0.1. 64 bit under Linux.
>
>Instead of picture-previews, I can see only cryptic icons (attachment).
>What do these icons mean?
>How can I avoid these?
>
>Is it necessary to "maintain" the darktable database?
>Or: Is this done automatically?
>
>Thank you
>
>
>
>Axel
>
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