This kind of spring (with two L-shaped pins) is used on the door of the meter box. So that once the door is released, the buckle of the door will automatically spring open. What is the name of this spring? please torsional spring

By rotating the arm around the central axis of the spring body, angular energy can be stored and released, or the device can be statically fixed.

The end of the torsion spring is fixed on other parts. When other parts rotate around the center of the spring, the spring pulls them back to the initial position, generating torque or rotating force.