Final answer:
The individual that has died is commonly called the Decedent for estate tax purposes.
Step-by-step explanation:
The individual that has died is commonly called the Decedent for estate tax purposes. When someone passes away, their assets go through a legal process called probate, where their debts are settled, and their remaining assets are distributed to the beneficiaries or heirs. The decedent is the person who has died, and their estate refers to all the assets and liabilities they leave behind.