On Mon, Aug 10, 2020 at 10:11:17AM +0300, Lassi Kortela wrote:
> I did a web search for `alphanumeric error codes` and got nothing except
> databases. So I wouldn't worry about them. 'number and 'symbol are fine.
> 'sqlstate for SQLSTATE codes.

"Alphanumeric error codes" brings to mind the status messages on
OpenVMS. They usually have a particular format. VMS process exit codes
are also more developed than on Unix, having an internal structure.

Here's some documentation:

http://h30266.www3.hpe.com/odl/i64os/opsys/vmsos84/6023/6023pro_001.html

/Göran