A double keyed door knob is a type of door knob that requires a key to be inserted and turned from either side of the door in order to unlock or lock it. This type of door knob is often used in high-security areas, as it provides an extra layer of protection against unauthorized entry. The double keyed door knob is typically constructed of durable materials such as brass or stainless steel, and the keyway is designed to be resistant to picking and bumping.