permissions

[Johann Spies <jhspies@adept.co.za>]

I have the following file in /lost+found:

br-xr-srw-   1 4462     25959    147, 103 Jul 25  2019 #1355791

Can somebody explain the following to me please:

1. The meaning of 'b' in the permissions.
2. The group end owner of the file
3. Why this file is so much different than the others I removed from
the same directory?

The abovementioned file refuses any chmod or removal even by root.

Regards.

Johann

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J.H. Spies, Hugenotestraat 29, Posbus 80, Franschhoek, 7690, South Africa
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      it leads only to evil."        Psalms 37:8