I know several people who would like a way to identify IRC operators.

Users that have channel ops or that are voiced have an @ or a + next to their name and can also have a different colour set in the address list settings.

Some clients add a check next to an Oper's nick and/or make the nick a different colour.

Doing a /WHOIS <nick> displays "<nick> is an IRC Operator" but it would be nice to have some other way to identify IRC operators.