It doesn't stand for anything. It is part of a name.
Full-Load Amps
It is the name of a liquid carbon dioxide supplier based in Stuart, Florida. Nu is for new and CO2 is carbon dioxide. Name is NuCO2.
Florida
Disney world Florida
Florida State University
The University of South Florida.
Funny Little Animals
Florida Comprehensive Assessment Test
Breast cancer
name them by things in Florida.
I don't live in Florida, but a good guess would be "vessel".