Introduces the object of an action or attitude, meaning "toward", "at", or "to"

ox; cow; bull; cattle; any of various bovine animals

to pluck or play a musical instrument; to flick or flip with the finger; to shoot (an object) with a catapult or by releasing a finger

The 古琴 gǔ​qín, a traditional Chinese seven-stringed zither; also called a 七弦琴 qī​xián​qín.