Doorknob

I tried to open the door, and the doorknob came off.

He turned the doorknob with his left hand.

He groped for the doorknob in the dark.

She turned the doorknob slowly.

I turned the doorknob.

I saw Tom wiping his fingerprints off the doorknob.

The only fingerprints that the police found on the doorknob were Tom's.

Tom turned the doorknob.

The doorknob broke.

Don't touch that doorknob.

A doorknob of whatever roundish shape is effectively a continuum of levers, with the axis of the latching mechanism—known as the spindle—being the fulcrum about which the turning takes place.