The @id counter

[Urban Planet]

Hello

As I can see, the ID field is a field with a 'derived value' built with the
string of characters @id.  I'd like to know more about its functionality:

Can the user set options?  For example, a counter that begin with a given
number, o a series of a countdown numbers....

Are there more possiblities with the @-sign?  For example, something like
@xx (not only @id)?

Thanks in advance!
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