Dream Symbols in the range of  Sp to Sz are being described here.

Spinach : Associated with strength. Remember Popeye?

Spiral : Dreaming of a spiral possibly denotes progress and evolution.

Stadium : Dream of stadium probably has something to do with the qualities that a stadium implies to you. It could be related to a sense of spectatorship or being at the focus of attention.

Staircase : Flight of staircase, esoterically, it symbolises the planes or dimensions of consciousness.

Steam : Steam appearing in the dream may denote having the feeling of anger. Steam coming from the ground represents  repressed anger that is about to surface.

Swamp, marsh : Areas in one’s life that are stagnating or not making much  progress. The conditions of the water in the swamp may be indicative of the  associative  emotional condition.Mud may represent complicated emotional issues and problems.
Swimming : could be indicative of how we handle emotions and feelings. For example:  Struggling to keep afloat in the dream may reflect the struggle we have with our emotional conditions.  Similarly, having an easy swimming may denote emotional confidence.