Suggested Triggers & Functions Naming Convention?

Hello,

i'm etablishing a naming convention for a new project under
postgresql. For tables, sequences, views, that's ok! I used good
naming conventions for this in the past and i'll keep these rules for
the new project.

but, i plan to use a lot of triggers and functions in this project,
but I'm confused! I know that triggers call already created functions.
But for tracking i must be able to associate these 2 different object
(IMO; from oracle world a trigger is a trigger, a function is a
function)

is someone have a good way to name normal functions & procedures,
triggers, trigger functions (function called by triggers)? because,
when i'll list all functions i dont want to be confused with the
complete list.

why is postgresql is not separing code from triggers and functions as
oracle do?
OR
why postgresql triggers must call functions?

IMO:
- a function is not defined to be called by a trigger (but a trigger
body can call functions)
- a function intended to be a trigger cannot be called in a select
clause (can i do it in postgres?)

thanx a lot to help me
Bruno