People talk about their 590 wings, their 633 wing, their surf wings, their lift wings etc. This is proprietary labeling by the manufacturer that tells us little. How would you like it if kite manufacturers labelled their kites with a span measurement or descriptions such as "freestyle" and never mentioned the area.
Often (but not always) the area of the wing is can be found if you search the internet. But really, why aren't hydrofoil wings labelled the same useful way that kites are?
Of course not all wings of a certain area are designed the same, but with kites you can have a 9 meter wave kite.. so why not use a descriptive wing label such as a 700 cm wave wing.
(I do see a couple of manufacturers labeling their bigger wings 1200 or 1500 which is very useful)
CG