Aries 
Aries symbolizes the Ram which governs the head. It is usually associated with reddish in color which implies clashes and confrontations thus a new change or starting over is strongly tied to this dream.
It also may be telling you that your personal matter may need be dealt head on, or may indicate a stressful situation you're going through at this time that needs attention and be taken care of right away.
Symbol
To dream of an unknown symbol represents your uncertainty, confusion, or lack of awareness for an issue. Pay attention to the symbol itself. The shape or similarity to another object may also hold importance.
Grammar
To dream that you are studying grammar indicates that you are having trouble expressing your point of view or thoughts.
Warning
To dream of a warning may be as simple as your unconscious mind making sure you are aware of a current happening in your waking life.
Heed any warnings in a dream, and check in with your emotions surrounding waking life warnings. Dreaming is often a way that more aligned aspects of yourself can offer important advice.
Scorpion
To dream of a scorpion signifies an experience that has caused you great pain or grief. It may also indicate insensitive and resentful words or thoughts that an enemy holds about you. Your dream warns that you may be treading into a territory that can only bring you sorrow and loss. The scorpion symbolizes change and a new beginning. It may be necessary for you to discard previous beliefs and ideals and adopt new ones. Also, the scorpion may be a symbol of a person who was born under the Scorpio zodiac sign.
To see scorpions floating in water signifies that you must resign yourself to the fact that an event or situation has indeed occurred and cannot be changed. There is a possibility that you are experiencing the stages of grief and learning to continue on with your life.
Alphabet
Dreaming of an alphabet generally signifies a return to learning, or going back to the fundamental basics of a concept. A combination of alphabetic letters or a specific alphabet in your dream has a certain significance to you. Therefore, examine these in the context of your waking life to determine what meaning they hold.
Aquarius
Dreaming of the Aquarius constellation symbolizes a new beginning.
To see yourself or somebody else as an Aquarian in your dream symbolizes fertility, growth and rapid change. In addition, it may also be a signal to slow down and take some time out to appreciate life. Consider a 'sea change'.
Autograph
To dream that you are asking someone for an autograph signifies that you wish you were like that person. You might also be in search of acceptance.
To dream that a person wants your autograph is symbolic of acquiescence.
Capricorn
To dream of the zodiac sign 'Capricorn' indicates that a stable, hardworking and confident person may be about to enter your life. You may feel abnormally confident, strong willed and calm in their presence but it is important that you acknowledge these qualities as coming from within so as to avoid projecting neediness onto this person. You may find that you will complete an unfinished goal due to their influence.
Cardboard
Dreaming of a pile of cardboard indicates a concern for wastage and the impact you are having on the earth. Dreaming of one piece of cardboard implies a habit of berating yourself for enjoying the finer things in life. To dream of creating something with cardboard suggests a desire to do the right thing by minimizing your carbon footprint.