She believed that she was an 'instrument' of God. [=she believed that God was using her to do things; she believed that God was acting through her]
Part of her training as a pilot involved learning to fly by 'instruments'. [=learning to fly only by looking at the instruments in the airplane]
Movies can be useful 'instruments' of social change. [=movies can be used to cause social change]
(..) However... ...leave the limbs you've lost. They belong to me now. Except you, Sofie! You stay right where you are. Your instrument is quite impressive. Where was it made? Okinawa. Whom in Okinawa made you this steel? This is Hattori Hanzo steel. (..)2003 Kill Bill: Vol. 1