The term PART OF SSS can be solved by two different crossword solutions: SYST (4 letters) and SYS (3 letters). SYST stands for System, which is a set of components that work together to achieve a goal. It can refer to a physical system, such as a computer system, or an abstract system, such as a business system. SYS stands for Systematic, which means organized and methodical. It is often used to describe a process that follows a specific set of steps in order to achieve a desired outcome.