Firewall rules standards

Hi all 
I support a number of customers using a number of different firewalls, and I
was wondering if anyone has any guidelines for the presentation firewall
rules or any firewall conventions when it comes to documenting the rules.
Ie name conventions for groups or services, or rules for the creation of
groups. Or the description of a rule
I know this would be hard and vary from administrator to administrator but I
was wondering if there is some sort of standard? My goal is to reduce the
amount of rules and make them readable.
Thanks
Nhon

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