What effect does clavicle have on human body?

The name of clavicle is really related to "lock". In the era of slavery, in order to prevent slaves from escaping, in addition to putting fetters on them, there is a more cruel method-using chains or iron hooks to penetrate two bones between the chest and shoulders. In normal times, this kind of torture device will not interfere with the labor of limbs, but if slaves disobey discipline, a slight pull on the chain will make them suffer severe pain and be forced to yield. So these two bones were named "clavicle".