What was the item placed on the scale to determine passage to the afterlife called

The scale would balance a feather against your heart — the pointwas to have your emotions (which are metaphorically centred aroundthe heart) be light and positive. Negative emotions, such as angeror hatred, would weigh down the heart and thus make it heavier thanthe feather. Should the scale determine such you were then barredfrom entry into the afterlife.