The term STAIRWELL FEATURE can be broken down into two parts: RAIL, which is a four letter word, and FEATURE. A RAIL is a bar or rod that provides support and stability, often found in stairwells. It is usually made of metal or wood and is used to provide a handrail for people to hold onto when climbing or descending the stairs. The FEATURE part of the term refers to the fact that a RAIL is an important part of a stairwell, providing safety and stability.