The term "roller" has several meanings depending on its context.
1) In a general sense, a roller is an object with a cylindrical shape that can be used to move or manipulate something by rolling it along a surface. For example, one might use a paint roller to spread paint onto a wall.
2) Roller may also refer to a type of sports equipment, such as in the case of rollerblades (inline skates), which have small wheels instead of blades and are used for recreational activities or sports like roller hockey.
3) In some contexts, "roller" can be used to describe an individual member of a group or organization, particularly if that person has a specific role or responsibility within the group. For example, one might say "John is our sales roller," meaning John is responsible for making sales on behalf of the company.
Overall, the term "roller" can have various meanings depending on its context and usage.