Alphabet & Letters
Letters of the Alphabet in dreams usually derive their symbolic value based on their shape and position in the alphabet. Some letters symbolize concepts that come from ancient cultures.

Animals
Animals in dreams are often symbols for behaviors, attitudes, and thinking patterns we have based the one characteristic of the animal that stands out most.

Birds
Birds in dreams usally represent trancendence and freedom as we overcome issues.  Unusual or rare birds often symbolize very specific behaviors, attitudes, and thinking patterns we have. Like animals, bird symbolism is usually based the one characteristic of the bird that stands out most.

Body Parts
Body parts have a range of meanings usually based on what's most characteristic about the body part.

Bugs
Bugs and insects in dreams are almost represent annoyances. Like animals, the dominant characteristic of the bug in your dream is usually what is being communicated to you about your own thoughts and emotions.

Cars & Vehicles
Vehicles in dreams represent your ability to make decisions in a given situation or the extent to which you feel in control of the direction your life is taking.

Clothing
Clothing in dreams is often used to describe or portray the personality. The colors and styles of clothing communicating your attitude and preferences.

Colors
Colors in dreams, after people are possibly the most significant symbols. They are used in dreams to classify your beliefs, emotions, and behaviors under a number of categories.

Countries & Cities
Countries in dreams symbolize a state of mind based on stereotypes or the generally perceived personality of the country. A specific mindset.

Directions
North, south, east, and west all have symbolic meanings as to where you are headed mentally, emotionally, or spiritually.

Emotions
Emotions in dreams often reflect how powerful or important you believe something is. They often mirror your waking emotional state.

Food
Food in dreams represents the type and qualities of thoughts and emotions you take inside yourself.  It's symbolic of how you nourish yourself mentally, and emotionally. Each food has a unique experience or energy associated with it.  Although many types of food can have universal meanings, in modern times many foods take on very personal meanings, especially if they are processed foods.

Hair
To dream of hair represents the type of thoughts that you're having. Your mindset.  The color and style of the hair represents the manner in which you are thinking.

Holidays
Holidays and birthdays in dreams are symbols for important times in your life where you will have experiences, insights, or face your karma.

Houses & Buildings
Houses and buildings in dreams are usually symbols for a perspective on a situation.  The type of building is symbolic for how your are thinking about a particular subject or issue.

Medical
Medical symbolism in dream often reflects issues with emotional, situational, or even physical healing.  You may have a problem that you are living with or trying to confront.

Money
Money in dreams symbolizes resources and power to achieve objectives, or do what you want in life.  Our potential, our energy, or our power to influence our lives.

Music
Music or sound in dreams most often represents how you feel.  What feelings are being projected outward by a person or situation you are experiencing.

Nightmares
Nightmares are symbolic messages about problems with negative thoughts, emotions, and habits that hold you back, or prevent you from being a more balanced and happier person.  They are attempting to communicate to you about problems with your personality that are holding you back.
 
Numbers
Numbers in dreams use the system of numerology to communicate to you the status of life events as well as your spiritual, mental, and emotional progress.

People
People in dreams are symbols for aspects of your own personality, or thinking patterns you have based on the one thing about them that stands out the most. Friends, family members, strangers, and even people we don't like all become symbols for our own thoughts or behaviors.

Planets
Planets in dreams most often represent the issues your life is revolving around.

Race & Skin Color
Race, culture, and skin color are very common symbols that are used most often to describe the personality of a trait you have. They often use cultural stereotypes to symbolize how a certain aspect of your personality is acting, or thinking.

School
To dream of a school represents social concerns, insecurities, or anxieties.  How well you are being perceived by others, or how well you are performing in life.  You may have something happening in your life that you are sensitive about, or that's very personal to you.

Sex
Sexual experiences in a dream usually reflect the merging of certain aspects of personalities into waking life experiences.  Most often pleasurable experiences.  Sex in a dream can also reflect your sexual interests.

Shapes
Shapes in dreams are often symbolic for what you are thinking or even experiencing in your life.

Spiritual
Spiritual and religious symbols are very common in dreams, however they more often than not have meanings that are totally unrelated to our personal spiritual beliefs and tend to reflect choices or feelings.

Sports & Exercise
Sports & excercise in a dream represents a mental or emotional conflict between positve and negative aspects of your personality.  Execising reflects you or some aspect of yourself that is improving or becoming stronger.

Technology
Technology in dreams can represent a wide array of thinking patterns.  While computers may reflect what we are thinking, cellphones can point to what it is we value the most.  While cameras may symbolize the impressions or memories that situations imprint upon is, a television can reflect the type of experiences we are having.
 
Time
Time in dreams is often used symbolically to let you know schedules, or what is happening currently in your life in regards to your life progress. They can use numerology to notify you about the status of an event, or even warn you or prepare you for a future event.

Water
Water in dreams most often symbolizes our negative unconscious thoughts and emotions, negative situations that bring uncertainty, the unfamiliar, obstacles, or unwanted changes.  Different bodies of water represent different forms of uncertainty in our lives that we must confront.

Weapons
Guns, knives, and other weapons in the dreams are symbols used to describe conflict or power struggles over choices.
 
Websites
Websites in dreams are usually symbols for types of experiences you are having in life.