Wholeness, totality, centering. Halos, for example, symbolize spiritual wholeness and focus (see Light).
Freudian: A vaginal emblem or symbol of femininity due to its shape.
Equality and unity.
The round table of King Arthur’s court gave everyone an equal voice and symbolized the solidarity of Britain.
Protected or sacred space. In the first century B.C.E., magicians were sometimes called “circle drawers” because ritual magic uses this emblem to contain power. Similarly, % fairy ring safeguards its residents from mortals.
Going around in circles: Being trapped in progressively worse cycles, outmoded ideas, or a static lifestyle with little achievement.
A circle with a point in the center is a type of mandala emblem representing personal wholeness, order, harmony, and healing.
God or divine influences and protection. There is a Hindu saying that God is an unbroken circle without a circumference, being nowhere and everywhere.... The Language of Dreams
If you dream of being gagged, for example, this represents either swallowing your words, or having your speech repressed by societal or situational standards.
An overexaggerated mouth can reveal a propensity to gossip or to dominate a
conversation with your own ideas.
Freudian: An alternative vaginal emblem.
With an extended tongue, the mouth becomes an emblem for gender unification, and therefore potent speech that affects all who listen.
It is only in recent years that this symbolism transposed into an insult. Depending on the remainder of the dream, this might reflect the need to watch your words, being certain they carry the intended meaning for the most powerful impact on the listener.
A mouth with a forked tongue represents lies, and purposeful misrepresentations with an aim of personal gain or profit.... The Language of Dreams
A tampon is used to stop the flow of blood that connects with menstruation and reflects a desire for certain natural experiences to be tidier and cleaner than they naturally are. What flow in your life are you trying to stop from moving naturally because of some sense of shame or inhibition?
There is an interesting use here of something phallic to alter something vaginal; look for where you are switching out a masculine approach when a feminine one would be more authentic.... Complete Dictionary of Dreams