1) Special period of extra study 
In swimming, the term short course (abbreviated SC) is used to identify a pool that is 25 metres (or 25 yards) in length. The term is also often included in meet names when conducted in a short course pool. `Short course` is the second type of pool configuration currently recognized by FINA and other swimming bodies for pool competition; the oth.....
A 25 yard or more usually a 25 metre pool.
See short course pool.