Triangle 
To dream of triangles signifies your goals, potential, and truth. It is also a symbol of spirituality and oneness of mind, body, and spirit. On one hand, it may also refer to a love relationship you have with two other people in your waking life.
Tricycle
To dream of a tricycle signifies the end of tension and cause of worry in your life. It also denotes your straightforward and free-spirited nature.
Waterbed
To dream of a waterbed is an indication that you have begun to accept some aspect of your inner self that you have previously struggled with. Generally, this aspect is emotional, although it can represent repressed sexual desires or aggression. Consider what aspects of yourself you are questioning.
Geranium
To dream about a geranium represents enduring beauty and persistent gracefulness.
Duckling
Seeing a duckling within a dream represents a return to your roots. Be careful not to get caught up in your past and forget to live in the present. If the duckling is swimming, it represents your forward movement away from the negative memory from your childhood.
Narcissus
To dream of a narcissus implies excessive pride in your appearance. This may also be a representation of a narcissistic person in one's life. Dreaming of narcissus likewise symbolizes great love.
Palm Tree
To dream of palm trees denotes a certain serenity and mighty aspirations. Dreaming of palm trees may also refer to your ambitious expectations and triumphs.
Rectangle
To dream of a rectangle symbolizes the number four because of its four sides and four corners. To notice a rectangle in your dream signifies stability, wealth, and control
Scientist
To dream that you are a scientist symbolizes your desire to try new things and express your individuality.
Incubator
To dream of an incubator hints that you require some stability and tranquility in your life. Alternatively, it represents your fresh and innovative ideas, as well as growth and development.
To dream that you are in an incubator indicates that you are handling your situation prematurely. It may also indicate your attempts to avoid real life trouble, responsibility, and obligations.