Letter "Z" can represent the idea of boredom or not feeling connected to life in some way.
Being last letter of alphabet, it can be describing the end of one road or course of action.
The letter Z in dreams is associated with the conclusion in life it can indicate that you have failed in seeing opportunities.
The good news is that if you see or write the letter Z in a dream it is associated with material attainment.
The Z also means that you will destroy any negativity in life.
A negative situation is either completely over or your beliefs about what constitutes negativity has completely changed.
This means that you are so positive that you can't stand to think about anything negative.