It's in the ForumRole.php hence the post in here,
new CheckableOption('CompanyPublic', new TextField('Address', _t('ForumRole.COMPANY', 'Company')), true),
I'm guessing that it tests for the existence of a Constant (which as far as I can see isn't set anywhere in v2.5) and so returns Company in the call above.
I'd like to know where this function/method called _t is?
should it be used in other places? is it a relic from version 0.0.0.1? I've read it could be a private method but don't know where to look.
possible answer = I think it's something to do with internationalization - i18n