Following are some of the abbreviations I have come across on wedding cards.
- RSVP
This is a French phrase - répondez s'il vous plaît, meaning "Please respond."
- RSVP, regrets only
As an extension of the above, this is written when expecting a lot of persons to attend and only those who will not be able to attend should respond.
- WBCF
With Best Compliments From
