L4

L4 may refer to a variety of concepts in different fields, including anatomy, computer science, and aviation. This article provides a comprehensive overview of these various interpretations of L4.

Anatomy

In anatomy, L4 refers to the fourth lumbar vertebra, one of the five vertebrae located in the lumbar spine. The lumbar vertebrae are the largest segments of the movable part of the spinal column, and are characterized by the absence of the foramen transversarium within the vertebra and by the absence of facets on the sides of the body. The fourth lumbar vertebra is typically larger than the vertebrae above it and plays a crucial role in supporting the weight of the upper body.

Computer Science

In computer science, L4 is a family of second-generation microkernels, used to form the core of some operating systems. L4 was first designed by Jochen Liedtke as a response to the performance issues of earlier microkernels. The L4 microkernel aims to provide a balance between the conflicting goals of microkernel design: high performance, small size, and high modularity.

Aviation

In aviation, L4 is a model of aircraft in the Piper Cub series. The Piper L4 Grasshopper is a military variant of the Piper J3 Cub, a small, simple, light aircraft that was built between 1937 and 1947 by Piper Aircraft. The L4 Grasshopper was used extensively in World War II for reconnaissance, transporting supplies, and medical evacuation.

See Also

• Lumbar vertebrae
• Microkernel
• Piper Aircraft

This disambiguation page lists articles associated with the title L4.