Probably a Catamaran (2 hulls).
Catamaran work boats are very common for the offshore wind farms round here, though most are smaller than that one.
I think I've only seen trimaran configurations for sail boats - I actually had a hydrofoil/trimaran combination sailing dingy years back, must see if I can find some shots of that!
I'm only a casual sailer (mostly for the photos and beer) so have no real idea. It's in the middle of Portsmouth Harbour so it may be for bigger ships than the forty footer we were on.
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