List of abbreviations used in writing a formal letter How to write a formal letter? by Expert Writer - February 17, 2014February 7, 20200 In the table below is a list of a abbreviations used in writing forma letters. Abbreviation Meaning / Usage ASAP As soon as possible attn attention:use to show that a letter is for the attention of a particular person fao for the attention of: used in front of someone’s name on a document, letter, or even envelope to show that it is intended for them cc Carbon copy (if the copy of letter is being sent to more than one receipant) c/o care of, often used in an address on a letter that is being sent to someone at another person’s house, or company enc. Enclosure (list of attachments to the letter) ps Postscript (when adding something after finishing and signing a letter) pp Used when signing the letter on somebody else’s behalf, because he/she is not able to sign letter (latin per procurationem) RSVP Please, reply back (fr, “répondez s’il vous plait” ) ref. reference: used in a business letter when giving the numbers and letters that show exactly which document or piece of information you are talking about re Reply PPS written before a note at the end of a letter, after the ps note