An abbreviation is a shortening of something, so if you dream of an abbreviation it can mean that you are looking for the easy way out of a dilemma.
The letters of the abbreviation can be important.
If they are the initials of someone you know, then you could be thinking about that person or about important qualities that are possessed by that person.
An abbreviation of the name of an organization or business can stand for the qualities that are represented by that organization or business.
For example, a dream of seeing the letters IRS can symbolize worries about money.
You should also think about the sounds of the letters in the abbreviation and of their shapes as well.
Do the letters or their sounds remind you of anything that you unconscious could be trying to communicate?