For sorting reasons I would recommend a structured approach:
TR_Users_ADTR_Users_BDTR_OtherTable_AI
and so on.
In the end it's up to you - but whatever you choose to do, stay consistent, at least within the same database.
I agree with @tomalak - but i normally spell out the action at the end instead of abbreviating it...
trig_Users_deletetrig_Users_inserttrig_OtherTable_Inserttrig_OtherTable_InsteadOfInsert