What does FT mean?

[Jayc]

I'm in the UK and someone asked recently what does FT stand for in a tomato description. After looking at some tomato sites often in the US some varieties have these letters. As an example, Sunsugar are described as Sunsugar FT Hybrid, it has got me wondering, what does the FT signify? I did think it could be disease resistance?

Many thanks in advance for any help.