SynthDef struct file: Variant-Spec

Hello again,
after long time I am getting back since I manged to do some progress in compiling and decompiling synthdefs through vvvv.
However I have a very specific question, what are the mentioned variant-spec (parameters) in the very last bytes of a compiled synthdef ?
What do they represent?

[ variant-spec ] * V
pstring - the name of the variant
[float32] * P - variant initial parameter values

Thanks in advance!

(PS: feel free to move my thread in different category if it doesnt match the context of current one)