This page covers Dream Symbols ranging from Sa to Se.

School, university : 1. May be related to some issues that  originated during younger school days.
2. Dreaming of being in school or university could be symbolic of lessons in life.

Seashell : 1. Associated with self-protection and security.
2. May indicate unusual experiences and/or events.

Seesaw : 1. Symbolises indecisiveness and procrastination. 2. Trying to strike a balance.

Having sex : 1.  Could  possibly be a release mechanism for repressed sexual tensions.
2. Could also signify the integration with an aspect of self (which is symbolised by the sex partner in the dream)

Sewer : To be in one may denote being in an unpleasant or negative situation.