ASAP - As soon as possible
RSVP - Please Respond
PFA- Please find Attached
O.T. - Overtime
EOM/EOD - End of the month/ End of the day
FYI - For your information
TBD - To be decided
N/A - Not Applicable
Memo- Memorandum ( To-do-list what needs to be done and what need not )
VP- Vice President