In your circuit, $L1$ is an inductor. Generally, an inductor is used to store energy in a magnetic field when electrical current passes through it. Inductors are often used in circuits for the following purposes:

In your specific circuit, without any additional context on the exact purpose of $L1$, it's possible that it might be used in a filtering or energy storage capacity. However, since your schematic doesn't include additional components commonly used with inductors in these roles, such as capacitors or driving circuits, do you have any specific application or requirement in mind for $L1$?