Lumbar refers to the lower end of the spine, usually known as the "small of the back", is known as the lumbar spine. It is an area that may be strained or tired when an individual is seated for extended periods. Office chairs, backrests, or back pillows may be designed to provide lumbar support.

In psychology, the term "lumbar" might be used to refer to the lower part of the spine, specifically the five vertebrae that are located in the lower back. The lumbar region of the spine is important for supporting the weight of the upper body and for providing mobility and flexibility to the lower back.

The term "lumbar" might also be used in the context of psychology to describe the psychological or behavioral characteristics of individuals who experience pain or discomfort in the lumbar region of the spine, or to describe the impact of lumbar pain on an individual's mental health or well-being.

For example, a psychologist might study the psychological or behavioral characteristics of individuals who experience chronic lumbar pain, or might examine the impact of lumbar pain on an individual's ability to function or participate in daily activities.

Overall, "lumbar" refers to the lower part of the spine, specifically the five vertebrae that are located in the lower back. It might be used in the context of psychology to describe the psychological or behavioral characteristics of individuals who experience pain or discomfort in the lumbar region of the spine, or to describe the impact of lumbar pain on an individual's mental health or well-being.