Marine dictionary

ULCC
stand for Ultra Large Crude Carrier, i.e. a crude oil tanker with deadweight more than 300,000 tons

VLCC
stand for Very Large Crude Carrier, i.e. a crude oil tanker with deadweight between 200,000 and 300,000 tons
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FPSO
stand for Floating Production Storage and Offloading; FPSO is a specialised vessel moored at sea to receive the crude oil directly from seabed, and provided with means to process, store and offload oil to conventional tankers coming to it; compare to FSO , it incorporates production facilities

FSO
stand for Floating Storage and Offloading; FSO is a specialised vessel moored at sea to receive stabilised crude oil directly from seabed, and provided with means to store and offload oil to conventional tankers coming to it; unlike FPSO , it is not equipped with processing facilities