[Home](./index.md) > [server](./server.md) > [RigidBody](./server.rigidbody.md) > [inversePrincipalAngularInertiaSqrt](./server.rigidbody.inverseprincipalangularinertiasqrt.md) ## RigidBody.inversePrincipalAngularInertiaSqrt property The inverse principal angular inertia square root of the rigid body. **Signature:** ```typescript get inversePrincipalAngularInertiaSqrt(): Vector3Like | undefined; ```