Saltpeter 
If you dream about saltpeter can indicate that you are about to enter a low period in life and experience incredible sorrow and heartache.
Sapphires
To dream of sapphires symbolizes security, spirituality, and divinity. It also indicates that you have a profound comprehension of your instincts and intuitions. You may be having thoughts or feelings about a person who has a September birthday.
Sculpture
To dream of a sculpture signifies that you are reluctant to see the truth. You may be anxious that you are not representing yourself with respect.
Sea Horse
To dream of a sea horse signifies the strength of your instinct and intuition. It may also symbolize a change in perception or attitude.
If the sea horse is invisible, then it indicates that you need to face your personal concerns rather than trying to evade them. Perhaps you need to adopt a fresh approach to a situation.
Seashells
To dream of seashells symbolizes the need for refuge and sanctuary. You are keeping your emotions and feelings hidden from others. This is being done in an effort to prevent yourself from being wounded emotionally, but the outcome will have you shutting the rest of the world out.
Seat Belt
To dream that you are wearing a seat belt implies that you are having difficulty expressing your feelings. You must learn how to control negative emotions and stay focused.
To dream that you are having trouble putting on your seat belt represents concerns that you have regarding upcoming events or situations.
Shoulders
To dream of your shoulders represents intensity, reliability, and afflictions. You may have been expected to handle too many obligations and certain situations are arduous for you to endure. Shoulders also symbolize your aptitude for offering encouragement and caring.
Skydiving
To dream that you are skydiving represents your great principals and morals. Perhaps you should lower your morals slightly and set more practical and sensible ambitions.
Smuggling
To dream that you are smuggling something implies that you are attempting to obtain something that you believe belongs to you. Someone or something is prohibiting you from collecting something that you are entitled to. Pay attention to the item you are smuggling as this may hold further symbolism.
Snowflake
To dream of a snowflake symbolizes your search for excellence and decency.