Yep, the "shaka" is definitely the same as the "Y" on the ASL club link!
But it's not quite the same as the "play" on the signing savy link.
The "shaka" (as I know it) is not shaking both hands up and down
like "play" (SS link) but more a one handed twist of the wrist with the
fingers in the "Y" symbol.
Now you've pretty much exhausted my knowledge about this.