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sailquik said.. >>>Of course they can call it any way they like.

(Although I very much doubt that 'back of the wave' stuff predates the modern era.)
But any other way, especially if it is more relevant to those using it, in any other place, is just as valid also.

And no, I have a nice multi scale on my anemometer and can easily decode those other, very relevant and valid wind measuring scales.

And I'm wondering how they do that, it's not easy judging the height of the back of the wave, there's nothing to compare it to. Methinks they judge the face of the wave against a rider, then halve it or whatever ratio they dream up. Then anybody receiving this info has to double it again to get actual face height.
I don't care how you call the height of a wave, what I'm interested in is the riderable face, and I don't see why double ended calculations should be involved, in order to get that.
And the other interesting thing, is the big wave challenge seems to be stated in face height, because they are judging the size of the wave from vids of the riders on it. You rarely see pictures of the back of the wave, let alone with any reference to judge their height.