Glacier 
To dream about a glacier indicates your unemotional feelings. You are closing down your emotions.
Grammar
To dream that you are studying grammar indicates that you are having trouble expressing your point of view or thoughts.
Gymnast
To dream of a gymnast represents intensity, poise, and flexibility. You are working towards your goals.
Harness
Harnesses are used to control or equip animals. To dream about a harness often reflects lack of freedom. You may be feeling restrained by your beliefs, and at times you feel others are holding you back.
History
To dream with historical themes suggests that you are subconsciously yearning to be in an earlier time. This may be related to past emotions or events, and may also indicate that you need to update your opinions and thinking. Enjoy living in the present.
Horizon
To dream of a horizon indicates the limitless potential of your life. It connotes the miracle in sunset, sunrise, birth, and death.
Hot Tub
Imagine sitting in a hot tub with steam coming out from the water beneath you. This evokes relaxation.
To dream about hot tub offers you a way out of your daily routine and stress. It brings instantaneous pleasure that belongs only to you. It can also reflect the hidden aspects of your unconscious.
Mercury
To see Mercury in your dream represents endurance, persistence, practicality, and rationalism. It also implies that you are working to your full potential.
Meerkat
In a dream a meerkat symbolizes an attentive mind. You should be keeping watch in your life for whatever ideas might pop up. Keep an eye out for opportunity.
To dream that you are a meerkat implies that you are keeping a keen eye over your dream, and that the other symbols you see in that dream have great significance.