Final answer:
ULCC stands for Ultra Large Crude Carriers and they are the largest ships in operation today.
Step-by-step explanation:
The largest ships in operation today are ULCC, which stands for Ultra Large Crude Carriers. ULCCs are specifically designed for the transportation of large quantities of crude oil. They have a massive carrying capacity, with some ULCCs capable of transporting up to 440,000 deadweight tons of crude oil.