Door 
To dream that you are entering through a door indicates fresh opportunities that you will encounter. You are moving into a new chapter in your life and to a different level of consciousness. A door that opens to the outside represents your desire to be available to others more. A door that opens inward suggests your wish to have self-realization or internal discovery.
To dream about opened doors represents your ability to take on new thoughts and ways of doing things. To see light behind the door indicates that you are on the path to better spiritual faith.
To dream about locked doors indicates that you have either been denied chances or that you have missed them. If you are on the outside of a locked door, then you may possess some characteristics that others would call anti-social. If you are on the inside of a locked door, then you must accept the knowledge of a difficult lesson.
To dream that you are locking doors indicates that you are shutting yourself off from others. You have difficulty letting people get to know you and this is significant of a halt in development or maturity.
To dream of revolving doors indicates that your life is simply moving in circles and nothing is moving you forward. You could be sensing that your choices are going nowhere.
Police
To dream of the police is a forewarning to avoid unacceptable behavior.
A dream involving a police officer symbolizes the establishment and its rules and regulations. It may also mean a failure on your part to fulfill and honor your responsibilities and promises.
To dream that you are arrested by the police suggests guilty feelings about your repressed emotions or sexuality.
To dream you are a police officer indicates your moral compass. Your dream may be directing you to a righteous path. If you have recurring dreams of being a police officer, it may mean a guilty past. Your dream calls for you to look at your acts and wrongdoings from police perspective.
To dream that you are having difficulties in contacting the police suggests ineffectual authority. Take command of a given situation and be in control of the circumstances in your life.
To dream of being pulled over by police suggests taking time off from your busy schedule and refraining from stressful activities.
To see or dream that you are chasing a felon suggests a moral dilemma which you need to resolve.
Knocking
To dream of knocking represents the attempt of your subconscious to bring a certain aspect of your life to greater consciousness. This may also mean the coming of a new opportunity.
Door Knocker
*Please see Knocker.
Revolving Door
*See Door.
Mat
To dream of mats implies that you will soon be facing times of anguish and grief.
Gun
To dream of a gun represents hostility, wrath, and possible hazards. Perhaps you are having difficulties expressing your positive and negative emotions. A gun can also be a symbol of male genitalia and masculine intensity. Therefore, it can represent intensity or incapacity.
To dream that you are loading a gun suggests that you should use caution when expressing your anger or hostility. Don't allow these emotions to go unchecked.
To dream that you shoot someone with a gun implies that you harbor hostility for someone.
To dream that someone is shooting you with a gun denotes a difficult issue that you are facing. An issue may be making you feel vulnerable and exposed.
*Refer to Pistol or Shot.
Knob
To dream of knobs symbolizes turning issues or situations in your waking life. Your dream is a sign that you must handle your affairs appropriately.
Latch
To dream of a latch predicts that you will receive an unsolicited call for help.
To dream of a broken latch denotes a major conflict between you and a very close friend.
Wagon
To dream of a wagon indicates trouble in your near future. Consider carefully the road you have chosen and careful consider your options. The wagon may further symbolize your ability to preserve your resources and use them in carefully planned endeavors.
If your life is filled with unhappiness or if you have recently suffered the loss of a friend or cherished possession, you are likely to dream of an empty wagon.
Walls
To dream of walls indicates that you have obstacles in your path. You options are somewhat limited. You, or some external force, are blocking your progress. This may be as simple as self-limitation due to relying on old patterns and ways of thinking.
When you dream of yourself jumping over a wall, it foreshadows a solution to your obstacles. You will soon remove the barrier in front of you.
When you dream that you have broken down a wall, it is a subconscious memory of a childhood trauma or an indication that a current relationship is souring. It may also be an indication that you have realized there are boundaries in your life and that you are comfortable with them.
When you see yourself hiding behind a wall, your subconscious is showing you that you are ashamed of yourself, your behaviors, or of friends or family.
If you are thrown at a wall, it is an indication that it is time to find a way to remove the walls that are limiting you. Consider finding a way to explore your surroundings and possible solutions to your waking life problems.
Bells
To dream about hearing a bell signifies a notice or a signal to come to order. This could also be your subconscious telling you that you need to be ready for what's coming. If the bells refuse to cease, you are undergoing severe anxiety.
Baton
Twirling a baton in your dream indicates a busy time in which your subconscious mind is expressing that you are "juggling" a lot right now, constantly moving and working.
Dreaming of a police baton symbolizes a threat, persecution, or hostile power in your waking life.
Sirens
To dream of hearing sirens signifies a situation or problem that is giving you much stress. The sirens may serve to get your attention and focus on the problem at hand.